I have disabled hardware acceleration in my chrome://settings. I have also visited chrome://flags and disabled every one of the flags listed in this post.

I restarted the system (and not just the browser), fired up chrome and here is the CPU usage graph shown in Windows Task Manager:

enter image description here

1 square (X-axis) = 5 seconds

The system was not connected to the internet when opening chrome. I only had 2 tabs restored in the window from last browsing session. I have only three browser extensions enabled at the moment:

  • HTTPS Everywhere 2015.8.13
  • ScriptSafe
  • ModHeader 2.0.5

What could be causing this much CPU usage, for such a large amount of time? As can be seen from the graph above, the CPU (including kernel times) stays at a constant 100% usage for at least 40 seconds.

After the usage drops down, it stays there for almost entire session, never going beyond 5%.


Chrome does not allow me to access Chrome Task Manager unless it has finished consuming CPU entirely. After the process is finished, I noticed only the 5 processes enlisted above (2 tabs and 3 plug-ins/extensions).

The page chrome://plugins lists the following active plugins:

  • Widevine Content Decryption Module - Version:
  • Chrome PDF Viewer (2 files)
  • Native Client
  • Adobe Flash Player - Version:

In Windows Task Manager's processes list, I see that chrome distributes the CPU usage evenly to all chrome.exe processes listed there. Thus, each of them has about 10-12% of CPU assigned to them.


System hardware:

  • Asus M5A97 Board
  • AMD FX-8320 Processor
  • 2x4GB DDR3 1800 MHz RAM
  • NVIDIA GeForce GTX 970 GPU
  • Samsung 840 EVO 120 GB SSD

The event trace log file can be downloaded from here.

  • Post your PC's hardware please. – Moab Oct 3 '15 at 13:59
  • @Moab added the details above – hjpotter92 Oct 3 '15 at 14:23
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    In Chrome activate chrome://flags/#trace-export-events-to-etw and run github.com/google/UIforETW to capture a xperf trace of the CPU usage. Zip and share the trace. – magicandre1981 Oct 3 '15 at 15:50
  • @magicandre1981 There is no flag regarding trace-export-events-to-etw. I'm downloading the package and will share the trace once done, if it is not dependent on the flag – hjpotter92 Oct 3 '15 at 17:13
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    only run this xperf command (the Win8.1 WPT also works in Win7, but not the Win10 WPT!!!) before you start chrome: pastebin.com/pgE11HRD after chrome is open and the CPU usage is gone, press a key to stop it. – magicandre1981 Oct 5 '15 at 4:22
  1. Have you tried Chrome Task Manager shift+esc? It will show you the tabs and extension that are active and taking that much of CPU usage.

  2. Determine if you have any plugins installed.

  3. Clear the Chrome browser cache.

  4. Try "The Great Suspender" from Chrome web store.

  • Sorry, I should have mentioned "Chrome does not allow me to access Chrome Task Manager unless it has finished consuming CPU entirely." Edited the question above as well. – hjpotter92 Oct 3 '15 at 9:51
  • have you tried other method ?? – BrotskyTv Oct 3 '15 at 9:52
  • I've listed the enabled plugins in the question above. I have tried restarting the browser after clearing caches. There was no effect whatsoever. In the Windows Task Manager, I see that chrome distributes CPU evenly to all the chrome.exe processes listed. I still have yet to try the great suspender app/extension though. – hjpotter92 Oct 3 '15 at 9:59

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