[timlloyd]

Yeah this is exactly the problem.........I can't mix with it at all atm. With a reasonable sized project not in playback, opening the mixer makes even the menubar menus slow. The whole application just can't keep up with itself with the mixer open.

Try this........it's interesting.

Create a new project and insert 30 empty tracks with no items and no effects.
Set VU meter update frequency to 20 and keep the project sitting idle.

Check cpu use with and without mixer open:
- without mixer - around 2.5%
- with mixer - around 20%

Change VU meter update frequency to 1
cpu use:
- without mixer - around 2%
- with mixer - around 2.5%

Keep mixer open and change vu frequency back to 20 and watch the cpu use rise dramatically once again.

This is with 3.52pre12

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This seems to suggest that the whole mixer window's refresh rate is linked to the vu meter update frequency, which seems TOTALLY unnecessary and could be the cause of the problem as related to the mixer.

hmmmm............

(laptop spec: 2008 17" MBP (internal screen res 1920x1200) 2.5GHz 2GB RAM 7200rpm internal HD - OSX 10.6.3)

If a few other people can try this and confirm the results then I'll make a separate bug report in the issue tracker. It could explain the mixer issue, but perhaps not the cpu use and slow GUI elsewhere when the mixer is closed.