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From: Test Rat <ttsestt@gmail.com>
To: Yuri <yuri@rawbw.com>
References: <4E364E1C.7040800@rawbw.com>
Date: Tue, 02 Aug 2011 14:09:18 +0400
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Cc: FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: Re: Xorg at 100%CPU when browser is on
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Yuri <yuri@rawbw.com> writes:

> I saw this with firefox, now I see the same with chrome.
>
> After a while when the browser is launched with ~10 tabs open, Xorg
> begins to consume 100% CPU and all graphics apps get
> sluggish. Quitting the browser brings situation back to normal.
[...]

Have you tried to reproduce with a more simple test case after looking
at what sorts of requests firefox/chrome sends to Xserver via xscope/xmon?
You can also trace what it's doing with pmcstat/dtrace.

I don't see your issue, only rarely the one in ports/156889.