Latest Version of FireFox renders about 80 times slower than previous versions?
We have a page that showes total work times of employees on a timeline which holds data for one year. This totals in 106219 nodes on that page. Previous versions of FireFox did not had issues with this, other browsers (Opera, Chrome, Edge) have also no issues and render the page in about 2 - 3 seconds. Not so Version 90.0.2 (32 bit). It now takes 4 minutes to render this page completely. Trying to debug this is impossible cause during rendering the browser is not responsive at all. Is this a bug that sneaked in or what can we do? This happens on fresh installs of Windows 10 with fresh installs of FireFox, that said it's not something that could be reset or cleaned etc. Any Ideas as to why FireFox struggles now with above mentioned number of nodes as oposed to earlier versions?
BR Markus
All Replies (7)
Make sure you are not blocking content.
Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}
A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?
https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
Many site issues can be caused by corrupt cookies or cache.
Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.
- How to clear the Firefox cache {web link}
Unfortunately this does not help at all. Since installing a fresh FireFox on a fresh clean install of Windows 10 also does not have any influence, but i.e. reduding the amount of time on the timeline that the website builds up (i.e. reducing the nuber of nodes) DOES make it faster (albeit still very slow), it's clear that the rendering engine got changes that make it 80 times slower than it used to be. If a FireFox developper is willing to take a look into this, I am willing to create a environement to log in and test it out. It must be something very obvious that was changed latels (in FireFox that is). For obvious reasons I can't do this "open to the world" though.
BR, Markus
It would be better to file a new bug on https://bugzilla.mozilla.org.
markus08 said
FredMcD said
Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?
...Unfortunately this does not help at all.
...
Firefox performed identically when you loaded the page in Troubleshoot Mode compared with regular mode? Okay, this might not be relevant.
If Troubleshoot Mode was faster, then I would have this comment:
Firefox 90.0 sought to reduce per-process memory use with a shared font list; that feature is disabled in Troubleshoot Mode. Could you try disabling it in regular mode to see whether that has any effect:
(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.
(2) In the search box in the page, type or paste gfx.e10s.font-list.shared and pause while the list is filtered
(3) Double-click the preference to switch the value from true to false. This might not take effect until the next time you exit/restart Firefox.
Any difference?
More info on about:config: Configuration Editor for Firefox.
Unfortunately this also did not had any influence. I will try to file a new bug then. Thank you guys for your help.
Maybe try the performance tool.