Why is my mouse lagging over Thunderbird / Firefox window?

3

1

In Thunderbird 31.5.0 I noticed an annoying mouse delay/stutter when mousing over the email list or folder pane. At the same time I see a CPU spike of about 25% (older WinXP dual core system).

Why is this happening / what can I do to optimize thunderbird for older systems?

( Update 9/2015: Also noticed this on Firefox and was able to fix it in about:config using the same layers.acceleration.disabled = true )

jacobsee

Posted 2015-03-03T17:55:32.050

Reputation: 861

Answers

2

There are two settings in Thunderbirds advanced settings (Tools > Options > Advanced > General > Config Editor) that might help this situation:

layers.acceleration.disabled = true (defaults to false, this one solved my problem)

gfx.direct2d.disabled = true (defaults to false)

jacobsee

Posted 2015-03-03T17:55:32.050

Reputation: 861

Thanks, this is a good point because the default changed in Thunderbird 31. The wiki has more information about it: http://kb.mozillazine.org/Performance_%28Thunderbird%29

– Nemo – 2015-06-04T05:19:17.270

Note: this fix works for Firefox as well! – jacobsee – 2015-09-24T15:47:39.687

Asked: 2015-03-03T17:55:32.050

Viewed: 562 times

Active: 2015-09-24T15:47:11.567