diff --git a/lib/client/hijack/wrapDynamicImport.js b/lib/client/hijack/wrapDynamicImport.js
index a83ab609..9939df4b 100644
--- a/lib/client/hijack/wrapDynamicImport.js
+++ b/lib/client/hijack/wrapDynamicImport.js
@@ -1,20 +1,20 @@
 import { Ntp } from '../../ntp';
 const meteorInstall = require('meteor/modules').meteorInstall;
 
-let oldFetch;
+let oldMeteorInstallFetch;
 export function wrapDynamicImport () {
-  oldFetch = meteorInstall.fetch;
+  oldMeteorInstallFetch = meteorInstall.fetch;
   meteorInstall.fetch = function (ids) {
     const start = Ntp._now();
-    const promise = oldFetch(ids);
+    const promise = oldMeteorInstallFetch(ids);
     Kadira.webVitals.pendingObjects += 1;
     return promise.then((...args) => {
-      Kadira.webVitals.importTime.push({start, end: Ntp._now(), ids});
+      Kadira.webVitals.importTime.push({start, end: Ntp._now(), ids: Object.keys(ids)});
       Kadira.webVitals.completedObjects += 1;
       return Promise.resolve(...args);
     });
   };
 }
 export function unwrapDynamicImport () {
-  meteorInstall.fetch = oldFetch;
+  meteorInstall.fetch = oldMeteorInstallFetch;
 }
diff --git a/lib/client/models/webVitals.js b/lib/client/models/webVitals.js
index 822a2f81..5ac44e4d 100644
--- a/lib/client/models/webVitals.js
+++ b/lib/client/models/webVitals.js
@@ -13,7 +13,7 @@ function calculateTimeframe (array) {
     if (current.end > acc.lastEnd) {
       acc.lastEnd = current.end;
     }
-    if (current.start > acc.firstStart) {
+    if (current.start < acc.firstStart) {
       acc.firstStart = current.start;
     }
     return acc;
@@ -32,6 +32,7 @@ export class WebVitalsModel {
   sent = false;
   pendingObjects = 0;
   completedObjects = 0;
+  dynamicImportTransferedSize = 0;
 
   addToQueue (metric) {
     this.queue.add({ metric: metric.value, metricName: metric.name });
@@ -41,12 +42,19 @@ export class WebVitalsModel {
     if (this.sent) {
       return;
     }
-    navigator.sendBeacon(`${Kadira.options.endpoint}/client-metrics`, this._buildPayload([...this.queue]));
+    const payload = this._buildPayload([...this.queue]);
+    navigator.sendBeacon(`${Kadira.options.endpoint}/client-metrics`, JSON.stringify(payload));
     this.sent = true;
   }
 
   stopTracking () {
     unwrapDynamicImport();
+    this.dynamicImportTransferedSize = performance.getEntriesByType('resource')
+      .filter(b => b.name.includes('/__meteor__/dynamic-import/fetch'))
+      .reduce((acc, cur) => {
+        acc += cur.transferSize;
+        return acc;
+      }, 0);
     unwrapSubscription();
     unwrapMethodCall();
     if (this.pendingObjects > 0 && this.pendingObjects === this.completedObjects) this.flushQueue();
@@ -142,7 +150,7 @@ export class WebVitalsModel {
       if (current.responseEnd > acc.lastResponseEnd) {
         acc.lastResponseEnd = current.responseEnd;
       }
-      if (current.startTime > acc.firstStartTime) {
+      if (current.startTime < acc.firstStartTime) {
         acc.firstStartTime = current.startTime;
       }
       return acc;
@@ -151,8 +159,8 @@ export class WebVitalsModel {
     metrics.resourcesTotalSize = totalSize;
     metrics.cachedResourcesTotalSize = cachedSize;
     // resources timeline
-    metrics.resourcesRequestStart = firstStartTime - this.startTime;
-    metrics.resourcesResponseEnd = lastResponseEnd - this.startTime;
+    metrics.resourcesRequestStart = firstStartTime;
+    metrics.resourcesResponseEnd = lastResponseEnd;
 
 
     metricsArray.forEach(m => {
@@ -168,26 +176,34 @@ export class WebVitalsModel {
 
     // dynamic import time is an array
     metrics.dynamicImportTime = this.importTime;
+    metrics.dynamicImportTransferedSize = this.dynamicImportTransferedSize;
     // aggregate dynamic import metrics
-    const {lastEnd: importsEnd, firstStart: importsStart} = calculateTimeframe(this.importTime);
-    metrics.importsStart = importsStart - this.startTime;
-    metrics.importsEnd = importsEnd - this.startTime;
-
+    if (this.importTime.length) {
+      const {lastEnd: importsEnd, firstStart: importsStart} = calculateTimeframe(this.importTime);
+      metrics.importsStart = importsStart - this.startTime;
+      metrics.importsEnd = importsEnd - this.startTime;
+    }
 
     // aggregate methods metrics
-    const {lastEnd: methodsEnd, firstStart: methodsStart} = calculateTimeframe(this.methods);
-    metrics.methodsStart = methodsStart - this.startTime;
-    metrics.methodsEnd = methodsEnd - this.startTime;
+    if (this.methods.length) {
+      const {lastEnd: methodsEnd, firstStart: methodsStart} = calculateTimeframe(this.methods);
+      metrics.methodsStart = methodsStart - this.startTime;
+      metrics.methodsEnd = methodsEnd - this.startTime;
+    }
 
     // aggregate subs metrics
-    const {lastEnd: subsEnd, firstStart: subsStart} = calculateTimeframe(this.subs);
-    metrics.subsStart = subsStart - this.startTime;
-    metrics.subsEnd = subsEnd - this.startTime;
-
-
+    if (this.subs.length) {
+      const {lastEnd: subsEnd, firstStart: subsStart} = calculateTimeframe(this.subs);
+      metrics.subsStart = subsStart - this.startTime;
+      metrics.subsEnd = subsEnd - this.startTime;
+    }
     const payload = {
       recordIPAddress: Kadira.options.recordIPAddress,
-      metrics,
+      // round all metrics to the nearest integer
+      metrics: Object.entries(metrics).reduce((acc,[key, value]) => {
+        acc[key] = Math.round(value);
+        return acc;
+      },{}),
       ...browserInfo,
       commitHash: Meteor.gitCommitHash,
       cacheCleaned: !localStorage?.length && !sessionStorage?.length,