This problem occurs exactly the same whether hardware acceleration is used or not, different cache levels, whatever.
All drivers are up to date, and directx 10 is installed.
The problem:
In sizable files, around 900 dpi grayscale with say 10 or more layers (I do comics), undos start to take a LOOONG time.
For example, I can draw 5 or 6 anchor points with the path tool. No problem. Multiple undo, I can wait 10 or 12 seconds to go back 5 or six steps.
A pain.
Same file, CS3, instantaneous.
Thoughts?
When hardware acceleration is off, should one assume the cpu is taking the load on as it does in CS3?
Just created a similar image to yours and it's pretty snappy - no delays here.
How much RAM have you installed? How much is allocated to CS4.
My System has 16gb ( cs4 set at 80% - Cache at 8 )so it may not be a realistic comparison. But, I did have a laggy undo / layer creation / menu when I first installed CS4, which was really annoying - a few tweaks in the prefs fixed it.
Maybe, just keep on tweaking.........upping the cache totally fixed the issues.....but, again, not very helpful as you've already tried the cache.
Okay, maybe you can help me make sense of this:
I ramped up the cache levels to 8. MUCH faster. Still not quite as fast as CS3 but a big improvement.
Even a little faster with hardware acceleration turned off.
I have 12 gbs of ram, with 8 dedicated to photoshop.
Do you think this means Id benefit from a faster video card?
On Vista . . .
Did not see the card on the list of Adobe tested video cards.
When I started using CS3 and large images I noticed massive lag issues, particularly with the brush rendering, over the past two years I have streamlined and optimised my system ( 5 main hard drives - 1: system 2: programs and general stuff 3: Large Format Files 4: PS scratch disk 5: Back up + System page file - the rest are secondary back ups and back ups of the back ups ( you can never have too many ) ) also it's fairly clean with very little internet access - I just go online to download updates and activate software - this means there's little risk of those nasties getting in and slowing things down....Oh and masses of RAM really helped ( but you have that!! ).....However, if you are using reasonable sized files you shouldn't really have performance issues....
I take it you're running Vista within the Mac O/S - that might take a performance hit. But I know nothing about Macs, except the apple mouse doesn't have a right click :)...
Best,
K.