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Old 11-09-2014, 08:06 AM   #1
HarryT
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Firefox 33.0.3 very slow?

Firefox updated itself to v33.0.3 a couple of day ago on my Windows 7 PC, and the new version seems very slow. In particular, when typing in text (as I'm doing now), there's a noticeable lag between pressing the key on the keyboard and the text appearing on the screen. Anyone else seeing the same thing?

This is the first version of FF that I've ever had this problem with. Hopefully the next update will fix it again!

The only plug-in I've got running is the spell-checker, and disabling that makes no difference.
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Old 11-09-2014, 08:33 AM   #2
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Hmmm. I see it's listed as a known bug:

https://www.mozilla.org/en-US/firefo.../releasenotes/

Quote:
Windows: Interface may be slow when typing or selecting text (1089183)
The workaround is listed as "Disable OMTC", but without any instructions on how to do this. A Google search has been unhelpful. Anyone know how to disable OMTC?
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Old 11-09-2014, 08:41 AM   #3
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You can disable OMTC by going to about:config (in Firefox ad searching for offmainthreadcomposition. Then you can disable it from there.
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Old 11-09-2014, 08:46 AM   #4
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Thanks, Jon - I was just coming back to say that I'd discovered that! Setting "layers.offmainthreadcomposition.enabled" to "false" and restarting FF does indeed fix the problem .

The bug is apparently related to the hardware acceleration in certain video drivers.
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Old 11-09-2014, 07:02 PM   #5
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I haven't had the problems that Harry described with v33.0.3, but I did have those same problems with either the last version or the one prior to that.

This version works fine for me.
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Old 11-10-2014, 05:24 AM   #6
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Quote:
Originally Posted by Lynx-lynx View Post
I haven't had the problems that Harry described with v33.0.3, but I did have those same problems with either the last version or the one prior to that.

This version works fine for me.
Looking at the commentary on the bug, it's been fixed for some video drivers, but not for others. My rather elderly laptop has an ATI Radeon chipset, which is one of the ones that appears still to have problems.
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Old 11-12-2014, 06:17 AM   #7
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This is starting to get annoying.

Now, in FF33.1, when I go into the "Advanced" editor here at MR, the entire editing panel blacks out, and then goes back to normal a few seconds later, only to black out again when I scroll the contents. FF seems to have messed up their video code big-time - perhaps it's time to move to Chrome?

EDIT: Not only MR, it's doing the same thing in Gmail's editor, too.

Last edited by HarryT; 11-12-2014 at 07:23 AM.
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