diff --git a/.gitignore b/.gitignore
index d12f04bb..a7049f1f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -64,3 +64,6 @@ sharedPlugins/scenario_loader/scenarios
 sharedPlugins/*/DISABLED
 
 \.cache-require-paths\.json
+
+# IDE
+.idea/
diff --git a/master.js b/master.js
index cba39301..358e911f 100644
--- a/master.js
+++ b/master.js
@@ -378,8 +378,13 @@ app.post("/api/getSlaveMeta", function (req, res) {
 	endpointHitCounter.labels(req.route.path).inc();
 	console.log("body", req.body);
     if(req.body && req.body.instanceID && req.body.password){
-    	console.log("returning meta for ", req.body.instanceID);
-    	res.send(JSON.stringify(slaves[req.body.instanceID].meta))
+    	if (slaves[req.body.instanceID]) {
+			console.log("returning meta for ", req.body.instanceID);
+			res.send(JSON.stringify(slaves[req.body.instanceID].meta))
+		} else {
+    		res.status(404)
+			res.send('{"status": 404, "info": "Slave not registered"}')
+		}
 	} else {
     	res.status(400);
     	res.send('{"INVALID REQUEST":1}');
diff --git a/sharedPlugins/researchSync/dumpResearch.lua b/sharedPlugins/researchSync/dumpResearch.lua
index 94b61b0a..27ec7946 100644
--- a/sharedPlugins/researchSync/dumpResearch.lua
+++ b/sharedPlugins/researchSync/dumpResearch.lua
@@ -1,13 +1,24 @@
-/silent-command
 
 local data = {};
+local force = game.forces["player"];
 
-for _, tech in pairs(game.forces["player"].technologies) do
-    if tech.enabled == true and tech.prototype.max_level == 4294967295 then
-        table.insert(data, tech.name .. ":" .. tostring(tech.researched) .. ":" .. tostring(tech.level) .. ":true");
+for _, tech in pairs(force.technologies) do
+    local progress;
+    if tech == force.current_research then
+        progress = force.research_progress
     else
-        table.insert(data, tech.name .. ":" .. tostring(tech.researched) .. ":" .. tostring(tech.level) .. ":false");
+        progress = force.get_saved_technology_progress(tech.name);
     end
+    local infinite = tech.enabled == true and tech.prototype.max_level == 4294967295;
+    local tech_data = {
+        tech.name,
+        tostring(tech.researched),
+        tostring(tech.level),
+        tostring(progress),
+        tostring(infinite),
+    }
+    tech_data = table.concat(tech_data, ':')
+    table.insert(data, tech_data);
 end
 
 game.write_file("researchSync.txt", table.concat(data, "\n"), false, 0)
diff --git a/sharedPlugins/researchSync/enableResearch.lua b/sharedPlugins/researchSync/enableResearch.lua
index 155a8ecc..4e5af42a 100644
--- a/sharedPlugins/researchSync/enableResearch.lua
+++ b/sharedPlugins/researchSync/enableResearch.lua
@@ -1,4 +1,4 @@
-/silent-command
+
 if game.forces['player'].technologies['{tech_name}'] then
     if 1 == {tech_infinite} then
         game.forces['player'].technologies['{tech_name}'].level = {tech_level}
diff --git a/sharedPlugins/researchSync/index.js b/sharedPlugins/researchSync/index.js
index adb811d5..d8cb5887 100644
--- a/sharedPlugins/researchSync/index.js
+++ b/sharedPlugins/researchSync/index.js
@@ -1,162 +1,311 @@
-const fs     = require('fs');
+const fs = require('fs');
 const needle = require("needle");
 
+
 class ResearchSync {
-    constructor(slaveConfig, messageInterface, extras = {}) {
-        this.config           = slaveConfig;
+    constructor(slaveConfig, messageInterface, extras = {}){
+        this.config = slaveConfig;
         this.messageInterface = messageInterface;
-        this.functions        = this.loadFunctions();
+        this.functions = {
+            dumpResearch: this.loadFunc("dumpResearch.lua"),
+			enableResearch: this.loadFunc("enableResearch.lua"),
+            updateProgress: this.loadFunc("updateProgress.lua")
+        }
 
         this.research = {};
-
-        setInterval(
-            () => {
-                this.pollResearch();
-                setTimeout(this.doSync.bind(this), 5000);
-            },
-            extras.researchSyncPollInterval || 30000
-        );
+        this.prev_research = {};
+        this.initial_request_own_data(
+            () => this.setup_sync_task(extras)
+        )
     }
 
-    pollResearch() {
-        // this.messageInterface("Polling Research\n")
-        this.messageInterface(this.functions.dumpResearch);
-    }
-
-    doSync() {
-        needle.get(this.config.masterIP + ':' + this.config.masterPort + '/api/slaves', (err, resp, slaveData) => {
+    initial_request_own_data(callback) {
+        const url = `${this.config.masterIP}:${this.config.masterPort}/api/getSlaveMeta`
+        const data = {
+            instanceID: this.config.unique,
+            password: this.config.clientPassword,
+        }
+        const options = {
+            headers: {'x-access-token': this.config.masterAuthToken},
+            json: true
+        }
+        needle.post(url, data, options, (err, res, techs) => {
             if (err) {
-                this.messageInterface("Unable to post JSON master/api/slaves, master might be unreachable");
-                return false;
+                console.log(`Can't get own slave data:`)
+                console.error(err)
+                return
             }
-            if (resp.statusCode !== 200) {
-                this.messageInterface("got error when calling slaves", resp.statusCode, resp.body);
-                return;
+            if (res.statusCode === 404) {
+                console.log('researchSync: slave is not registered yet. Delaying for 5 secs')
+                setTimeout(
+                    () => this.initial_request_own_data(callback),
+                    5000
+                )
+                return
             }
+            if (res.statusCode !== 200) {
+                console.log(`Can't get own slave data:`)
+                console.error(`status code ${res.statusCode}, ${res.body}`)
+                return
+            }
+            techs = JSON.parse(techs)
+            if (typeof techs.research === 'object')
+                this.research = techs.research
+            console.log('researchSync: techs imported from master')
+            callback()
+        })
+    }
 
-            let needResearch = {};
+    setup_sync_task(extras) {
+        const timeout = extras.researchSyncPollInterval || 5000
+        setInterval(() => this.sync_task(), timeout);
+    }
 
-            Object.keys(slaveData).forEach(instanceKey => {
-                if (slaveData[instanceKey].unique === this.config.unique.toString()) {
-                    return;
-                }
-                if (!slaveData[instanceKey].hasOwnProperty('meta')
-                    || !slaveData[instanceKey].meta.hasOwnProperty('research')
-                ) {
-                    return;
-                }
-                let researchList = slaveData[instanceKey].meta.research;
-                if (researchList) {
-                    Object.keys(researchList).forEach(researchName => {
-                        if (
-                            isNaN(researchList[researchName].researched)
-                            || isNaN(researchList[researchName].level)
-                            || isNaN(researchList[researchName].infinite))
-                        {
-                            return;
-                        }
-                        if (needResearch.hasOwnProperty(researchName)) {
-                            if (
-                                needResearch[researchName].infinite === 1
-                                && needResearch[researchName].level < parseInt(researchList[researchName].level)
-                            ) {
-                                needResearch[researchName].level = parseInt(researchList[researchName].level);
-                            } else if (
-                                needResearch[researchName].researched === 0
-                                && parseInt(researchList[researchName].researched) === 1
-                            ) {
-                                needResearch[researchName].researched = 1
-                            }
-                        } else {
-                            needResearch[researchName] = {
-                                researched: parseInt(researchList[researchName].researched),
-                                level     : parseInt(researchList[researchName].level),
-                                infinite  : parseInt(researchList[researchName].infinite)
-                            };
-                        }
-                    });
-                }
-            });
+    sync_task() {
+        this.messageInterface(this.functions.dumpResearch);
+        setTimeout(this.request_cluster_data.bind(this), 2000);
+    }
 
-            let difference = this.filterResearchDiff(this.research, needResearch);
+    request_cluster_data() {
+        const slaves_data_url = `${this.config.masterIP}:${this.config.masterPort}/api/slaves`
+        needle.get(slaves_data_url, this.sync_researches.bind(this))
+    }
 
-            let count = Object.keys(difference).length;
-            let counter = 1;
-            Object.keys(difference).forEach((key) => {
-                if (this.research[key]) {
-                    let command = this.functions.enableResearch;
-                    while (command.includes("{tech_name}")) {
-                        command = command.replace("{tech_name}", key);
-                        command = command.replace("{tech_researched}", difference[key].researched);
-                        command = command.replace("{tech_level}", difference[key].level);
-                        command = command.replace("{tech_infinite}", difference[key].infinite);
-                        command = command.replace("{notify}", count > 1 || count === counter ? 'false' : 'true');
-                    }
-                    this.messageInterface(command);
-                    let log_message = '';
-                    if (difference[key].infinite === 1) {
-                        log_message = 'Unlocking infinite research ' + key + 'at level ' + this.research[key].level;
-                    }  else {
-                        log_message = 'Unlocking research ' + key;
-                    }
-                    console.log(log_message);
-                    this.messageInterface(log_message);
-                    this.research[key] = difference[key];
-                    ++counter;
-                }
-            });
+    sync_researches(err, resp, slaves_data) {
+        if (err) {
+            this.messageInterface("Unable to post JSON master/api/slaves, master might be unreachable");
+            return false;
+        }
+        if (resp.statusCode !== 200) {
+            this.messageInterface("got error when calling slaves", resp.statusCode, resp.body);
+            return;
+        }
 
-            needle.post(this.config.masterIP + ':' + this.config.masterPort + '/api/editSlaveMeta', {
-                instanceID: this.config.unique,
-                password  : this.config.clientPassword,
-                meta      : {research: this.research}
-            }, {headers: {'x-access-token': this.config.masterAuthToken}}, function (err, resp) {
-                // success?
-            });
+        slaves_data = Object.values(slaves_data)
+        slaves_data = slaves_data.filter(
+            slave_data => slave_data.unique !== this.config.unique.toString()
+                && slave_data.meta && slave_data.meta.research
+        )
+
+        this.clear_contribution_to_researched_techs()
+        let cluster_techs = this.get_cluster_techs(slaves_data)
+        this.recount_cluster_research_progress(slaves_data, cluster_techs)
+
+        let to_research = this.filter_researched_techs(cluster_techs)
+        let to_update_progress = this.filter_updated_techs(cluster_techs, to_research)
+
+        this.research_technologies(to_research)
+        this.update_technologies_progress(to_update_progress)
+
+        this.print_own_contribution()
+
+        needle.post(this.config.masterIP + ':' + this.config.masterPort + '/api/editSlaveMeta', {
+            instanceID: this.config.unique,
+            password: this.config.clientPassword,
+            meta: {research: this.research}
+        }, {headers: {'x-access-token': this.config.masterAuthToken}, json: true}, function (err, resp) {
+            // it doesn't get called
+            if (err)
+                console.error(err)
+            else
+                console.log('sent')
         });
     }
 
-    filterResearchDiff(localResearch, remoteResearch) {
-        let diff = {};
-        Object.keys(localResearch).forEach((key) => {
-            if (remoteResearch.hasOwnProperty(key)) {
-                if (
-                    (localResearch[key].infinite === 0 && localResearch[key].researched === 0 && remoteResearch[key].researched === 1)
-                    ||
-                    (localResearch[key].infinite === 1 && localResearch[key].level < remoteResearch[key].level)
-                ) {
-                    if (!isNaN(remoteResearch[key].researched) && !isNaN(remoteResearch[key].level) && !isNaN(remoteResearch[key].infinite)) {
-                        diff[key] = {researched: remoteResearch[key].researched, level: remoteResearch[key].level, infinite: remoteResearch[key].infinite};
+    clear_contribution_to_researched_techs() {
+        // if between updates tech was researched
+        if (!this.prev_research)
+            return
+        for (let [name, research] of Object.entries(this.research)) {
+            let researched
+            if (research.infinite)
+                researched = this.prev_research[name].level < research.level
+            else
+                researched = this.prev_research[name].researched < research.researched
+
+            if (researched)
+                research.contribution = 0
+        }
+    }
+
+    get_cluster_techs(slavesData) {
+        let cluster_techs = {}
+        for (let slave_data of slavesData) {
+            let node_researches = slave_data.meta.research
+            for (let [name, node_tech] of Object.entries(node_researches)) {
+                if (isNaN(node_tech.researched) || isNaN(node_tech.level) || isNaN(node_tech.infinite))
+                    continue
+
+                if (cluster_techs[name]) {
+                    if (cluster_techs[name].infinite === 1 && cluster_techs[name].level < node_tech.level) {
+                        cluster_techs[name].level = node_tech.level
+                    } else if (node_tech.researched > cluster_techs[name].researched) {
+                        cluster_techs[name].researched = 1
                     }
+                } else {
+                    cluster_techs[name] = node_tech
                 }
             }
-        });
-        return diff;
+        }
+        return cluster_techs
     }
 
-    loadFunctions() {
-        return {
-            dumpResearch  : this.loadFunc("dumpResearch.lua"),
-            enableResearch: this.loadFunc("enableResearch.lua"),
-        };
+    recount_cluster_research_progress(slaves_data, cluster_researches) {
+        for (let [name, research] of Object.entries(cluster_researches))
+            research.progress = this.research[name].contribution
+
+        for (let slave_data of slaves_data)
+            for (let [name, research] of Object.entries(slave_data.meta.research))
+                if (!isNaN(cluster_researches[name].progress) && !isNaN(research.contribution))
+                    cluster_researches[name].progress += research.contribution
+
+        for (let [name, research] of Object.entries(cluster_researches)) {
+            if (research.progress > 1) {
+                research.progress = null
+                research.researched = 1
+                this.research[name].contribution = 0
+                research.contribution = 0
+                if (this.research[name].level >= research.level)
+                    research.level = this.research[name].level + 1
+            }
+        }
     }
 
-    loadFunc(path) {
-        return fs.readFileSync("sharedPlugins/researchSync/" + path, 'utf-8').replace(/\r?\n|\r/g, ' ');
+    filter_researched_techs(cluster_researches) {
+        let local_researches = this.research
+        let result = {};
+        for (let key in local_researches) {
+            if (!cluster_researches[key])
+                continue
+            if (isNaN(cluster_researches[key].researched) || isNaN(cluster_researches[key].level))
+                continue
+
+            let researched
+            if (local_researches[key].infinite)
+                researched = local_researches[key].level < cluster_researches[key].level
+            else
+                researched = local_researches[key].researched < cluster_researches[key].researched
+
+            if (researched)
+                result[key] = cluster_researches[key]
+        }
+        return result;
     }
 
+    filter_updated_techs(cluster_techs, to_research) {
+        let local_techs = this.research
+        let result = {}
+        for (let name in local_techs) {
+            if (name in to_research || !cluster_techs[name])
+                continue
+            if (isNaN(cluster_techs[name].progress))
+                continue
+            if (local_techs[name].progress < cluster_techs[name].progress)
+                result[name] = cluster_techs[name]
+        }
+        return result
+    }
+
+    research_technologies(to_research) {
+        for (let name of Object.keys(to_research))
+            if (!this.research[name])
+                delete to_research[name]
+
+        const notify = Object.keys(to_research).length === 1
+        for (let [name, tech] of Object.entries(to_research)) {
+            this.research[name].contribution = 0
+            this.research[name].progress = null
+            let command = this.functions.enableResearch;
+            command = command.replace(/{tech_name}/g, name);
+            command = command.replace(/{tech_researched}/g, tech.researched);
+            command = command.replace(/{tech_level}/g, tech.level);
+            command = command.replace(/{tech_infinite}/g, tech.infinite);
+            command = command.replace(/{notify}/g, notify);
+            this.messageInterface(command);
+            let log_message = tech.infinite
+                ? `Unlocking infinite research ${name} at level ${this.research[name].level}`
+                : `Unlocking research ${name}`
+            console.log(log_message);
+            this.messageInterface(log_message);
+            this.research[name] = tech;
+        }
+    }
+
+    update_technologies_progress(to_update) {
+        for (let [name, tech] of Object.entries(to_update)) {
+            if (!this.research[name])
+                continue
+            let progress = this.research[name].progress
+            if (progress === null)
+                progress = 'nil'
+            let command = this.functions.updateProgress
+            command = command.replace(/{tech_name}/g, name)
+            command = command.replace(/{last_check_progress}/g, progress)
+            command = command.replace(/{new_progress}/g, tech.progress)
+            this.messageInterface(command);
+            console.log(
+                `Updating ${name}: ${this.research[name].progress} += ${tech.progress - this.research[name].progress}`
+            );
+            this.research[name].progress = tech.progress
+        }
+    }
+
+    print_own_contribution() {
+        if (!this.prev_research)
+            return
+        for (let [name, tech] of Object.entries(this.research)) {
+            if (!this.prev_research[name])
+                continue
+            let diff = this.research[name].contribution - this.prev_research[name].contribution
+            if (Math.abs(diff) > Number.EPSILON * 1000)
+                console.log(`Own research ${name}: ${this.research[name].progress} += ${diff}`)
+        }
+    }
+
+    loadFunc(path, silent=true) {
+        let command = fs.readFileSync("sharedPlugins/researchSync/" + path,'utf-8')
+        command = command.replace(/\r?\n|\r/g,' ')
+        command = (silent ? '/silent-command ' : '/c ') + command
+        return command;
+    }
     scriptOutput(data) {
-        let kv         = data.split(":");
-        let name       = kv[0];
-        let researched = ('true' !== kv[1]
-            ? 0
-            : 1);
-        let level      = parseInt(kv[2]);
-        let infinite   = ('true' !== kv[3]
-            ? 0
-            : 1);
-        if (!isNaN(level) && !isNaN(researched)) {
-            this.research[name] = {researched: researched, level: level, infinite: infinite};
+        let [name, researched, level, progress, infinite] = data.split(":")
+        researched = +(researched === 'true')
+        infinite = +(infinite === 'true')
+        level = parseInt(level);
+        if (progress === 'nil')
+            progress = null
+        else
+            progress = parseFloat(progress)
+
+        if (isNaN(level) || isNaN(researched))
+            return
+        this.prev_research[name] = this.research[name]
+        if (!this.prev_research[name]) {
+            this.prev_research[name] = {
+                researched: null,
+                level: null,
+                progress: null,
+                contribution: 0,
+                infinite,
+            }
+        }
+        this.research[name] = {
+            researched,
+            level,
+            progress,
+            contribution: this.prev_research[name].contribution,
+            infinite
+        }
+        if (this.prev_research[name].progress && this.research[name].progress) {
+            // this.prev_research[name].progress gets updated to overall cluster progress
+            // therefore contribution should be own research progress change over sync interval
+            let contribution = this.research[name].progress - this.prev_research[name].progress
+            this.research[name].contribution += contribution
+        }
+        if (Math.abs(this.research[name].contribution) < Number.EPSILON * 1000) {
+            // if contribution should be 0 but because of floating-point precision is e.g. 2.2564e-18
+            this.research[name].contribution = 0
         }
     }
 }
diff --git a/sharedPlugins/researchSync/index.spec.js b/sharedPlugins/researchSync/index.spec.js
index eae51abc..372bf01e 100644
--- a/sharedPlugins/researchSync/index.spec.js
+++ b/sharedPlugins/researchSync/index.spec.js
@@ -9,7 +9,7 @@ describe("researchSync/index.js", ()=>{
 		assert.equal(typeof researchSync, "function");
 	});
 	describe("class researchSync()", ()=>{
-		it(".filterResearchDiff(object1, object2) returns research that needs enabling on the local instance", ()=>{
+		it(".filter_researched_techs(object1, object2) returns research that needs enabling on the local instance", ()=>{
 			let reSync = new researchSync({}, function(){});
 			
 			let obj1 = {
@@ -24,9 +24,9 @@ describe("researchSync/index.js", ()=>{
 				c:{researched: false, level: 0},
 				e:{researched: false, level: 50},
 			};
-			assert(typeof reSync.filterResearchDiff == "function");
+			assert(typeof reSync.filter_researched_techs == "function");
 			
-			let diffResult = reSync.filterResearchDiff(obj1, obj2);
+			let diffResult = reSync.filter_researched_techs(obj1, obj2);
 			
 			assert(diffResult.a === undefined);
 			
diff --git a/sharedPlugins/researchSync/updateProgress.lua b/sharedPlugins/researchSync/updateProgress.lua
new file mode 100644
index 00000000..0d07bb84
--- /dev/null
+++ b/sharedPlugins/researchSync/updateProgress.lua
@@ -0,0 +1,33 @@
+
+local function get_tech_progress(force, tech)
+    if tech == force.current_research then
+        return force.research_progress
+    else
+        return force.get_saved_technology_progress(tech.name);
+    end
+end
+local function set_tech_progress(force, tech, progress)
+    if tech == force.current_research then
+        force.research_progress = progress
+    else
+        force.set_saved_technology_progress(tech.name, progress);
+    end
+end
+
+local force = game.forces['player']
+local tech_name = '{tech_name}'
+local tech = force.technologies[tech_name]
+local last_check_progress = {last_check_progress}
+local new_progress = {new_progress}
+
+local progress_delta = get_tech_progress(force, tech)
+if last_check_progress ~= nil then
+    progress_delta = progress_delta - last_check_progress
+end
+if progress_delta ~= nil then
+    new_progress = new_progress + progress_delta
+end
+if new_progress > 1 then
+    new_progress = 1
+end
+set_tech_progress(force, tech, new_progress)