Menu lag on an old laptop

[Kok, Auke]

Richard Querin wrote:
> On Tue, Aug 12, 2008 at 2:25 PM, áÒÔÅÍ óÍÉÒÎÏ× <smirnoffjr at gmail.com> wrote:
>> I can confirm this issue with modern videocards: same with Intel i815,
>> GeForce 7600 and GeForce 8600 with direct rendering in all cases.
>>
>> 2008/8/12 samuel <samuel.verstraete at gmail.com>:
>>> On Tue, Aug 12, 2008 at 5:50 PM, Hex1a4 <hex1a4 at gmail.com> wrote:
>>>> Hi,
>>>>
>>>> On XFCE 4.4.2, on an old laptop. With compositing enabled, the menu lags
>>>> a lot.
>>> disable composition... the driver of your gpu is almost certainly not
>>> doing any acceleration, so composition is completely done on your
>>> cpu... which is already
> 
> This might sound silly (or stupid on my part), but on my 5 year old P4
> machine, I had all sorts of problems in system lag (with and without
> Compiz). It has 32MB of shared on-board video ram (Intel 915 chipset).
> The problem was that the video ram was only set to 8MB in the bios.
> Once I upped that to 32MB, the lag essentially disappeared and it
> became much more stable. I can run almost all Compiz effects on it
> without much problem although xfwm4 works better for me so I use that
> instead. Granted, 32 is a lot more than 16. You might just want to
> check the bios and make sure that all 16MB is getting used.

actually we found a bug recently in the intel gfx driver that causes composite to
be terribly slow on some systems. I doubt that the fix is upstream already, but
this will definately get fixed in the near future.

Increasing memory allocated to the GPU will definately help though, and that's
really what the core issue is related to (not enough buffer memory available).

Auke