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Tags: firefox   fonts   chromium   performance  
Link: πŸ” See Original Answer on Ask Ubuntu πŸ”—

URL: https://askubuntu.com/q/1089834
Title: Firefox freezing with 100% CPU usage for 30 seconds when launching Chromium
ID: /2018/11/04/Firefox-freezing-with-100_-CPU-usage-for-30-seconds-when-launching-Chromium
Created: November 4, 2018    Edited:  June 12, 2020
Upload: November 24, 2022    Layout:  post
TOC: false    Navigation:  false    Copy to clipboard:  false


Background

It has been proposed this Firefox Bug 1492360: High CPU usage when open Firefox before chrome/chromium. That is a duplicate of Bug 1495900: Starting Chrome makes Firefox content processes hang for about two minutes, due to FontConfig font rescanning (FcInitReinitialize), is the culprit.

But I’m on Firefox too:

Firefox version.png

And when I open up Chrome:

Chrome version.png

I don’t see any performance hit to CPUs.

It may be against your morals but perhaps you can try installing google-chrome-stable like I have. Then do the test again. If there is no CPU usage spike to 100% then a bug report could be filed between Chromium and Chrome.

I’m on Ubuntu 16.04.5 LTS. Although kernel is currently 4.14.78 LTS chain I don’t think that has anything to do with it as I didn’t notice CPU hits on previous kernels either.

The only time I see all CPU’s at 100% is during update-initramfs.


fontconfig version

In the bug report it is revealed:

$ dpkg -l 'fontconfig*' | grep "^ii"
ii  fontconfig        2.12.6-0ubuntu2 amd64        generic font configuration library - support binaries
ii  fontconfig-config 2.12.6-0ubuntu2 all          generic font configuration library - configuration

In my non-buggy version (could be because of no local fonts though):

$ dpkg -l 'fontconfig*' | grep "^ii"
ii  fontconfig        2.11.94-0ubuntu1.1 amd64        generic font configuration library - support binaries
ii  fontconfig-config 2.11.94-0ubuntu1.1 all          generic font configuration library - configuration

I’m at 2.11.94 version earlier than bug report 2.12 version. In bug report upgrading to 2.13 is a recommended solution but OP mentioned in comments this isn’t possible. As such 2.11.94 might be an option.

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