JavaScript Canvas performance inconsistant with developer tools

Not reproducible Issue #396568


Jun 26, 2014
This issue is public.
Reported by 0 people

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Steps to reproduce


Repro Steps:

  1. Goto http://srvr-clw/bugs/67470/timer.html
  2. Use key sequence W A S D to move around or you can mouse around…IE11 slow response
  3. Hit F12>then UI Responsiveness>then Debugger > Then Console > Then Exit Dev tools
  4. Use WASD or Mouse around and see that performance is now more normal in IE11
  5. Try DC1, FF or Chrome to see the expected performance

Expected Results:

On FireFox the same application runs at 60fps, with IE 10 it runs at 50fps. With IE 11 it runs at 10fps. If I enter Developer Tools (F12), and select the performance tab then debug tab and then JavaScript Console tab and exit. The application then runs at 60fps, I am using an ACER laptop.

Actual Results:

Dev Channel specific:



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    Comments and activity

    • Microsoft Edge Team

      Changed Assigned To to “Rico M.”

      Changed Title from “JavaScript Canvas performance inconsistant.” to “JavaScript Canvas performance inconsistant with developer tools”

      Changed Assigned To to “Ben K.”

      Changed Assigned To to “Christian F.”

      Changed Assigned To from “Christian F.” to “Li-Hsin H.”

      Changed Status to “Confirmed”

      Changed Status from “Confirmed” to “Won’t fix”

      Changed Status from “Won’t fix” to “Not reproducible”

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