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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 )

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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)

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