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It's your machine or setup...
Using a dual G5 2ghz with 6 gigs of ram, 1DsMII and 3 files show no slowdown (other than the 1DsM3's taking a bit of time opening and getting rid of the rendering triangle).
Once open, sliders respond immediately and switching between panels is fast even with 4.3.1 at full screen.
You don't mention what ram you've set for Photoshop...and this can have an impact since Camera Raw must get it's ram allocation from Photoshop and if you run PS with a too high ram allocation you can see slowdowns and spinning beach balls. Even with 5 gigs, you prolly don't want the ram allocation to go beyond 75% or so.
I'll try playing around with the RAM allocation.
As an aside, the CR2 files of the DNGs seem to play a bit better with ACR.
Adjusting the RAM seemed to work a bit. However, still not as smooth as CS2 was. Any other ideas?
No real differences between CR2 and DNG on my system. I DON'T have auto-update DNG Previews selected in the CR Preferences, do you?
I did have it selected - but changing the option hasn't done anything performance wise. It's now off.
I have experienced similar sluggish behavior with ACR. Attempting to drag a slider frequently doesn't work at all and I have to resort to clicking on the slider "track".
I still have CS2 on my machine and working with the same DNG in ACR 3 and ACR 4 is a night and day difference. There is next to no lag in the sliders in ACR 3 and painfully slow slider tracking in ACR 4.
For a while I thought it was the way the DNG was made (embed original RAW file was selected). No performance increase happened after making a DNG without that option.
This is extremely frustrating. If anybody has suggestions, i'm all ears!
I have managed to "fix" the problem. Apparently camera raw slows down as the size of the window increases. Running it full screen brings the most latency to the sliders. Resizing the window to the smallest size removes the latency from the sliders and they track just fine.
Would be interested in hearing if this "fixes" it for other users.
>Would be interested in hearing if this "fixes" it for other users
There must be something else in your system, I can't reproduce your fix method because there is no difference between the speed in ACR3 and ACR4, they both work very good and fast.
I don't know if the fact that you have both ACR plug ins installed does cause problems. It probably should not because the are both part of their own settings installed in seperate folders in the Root library plug in folder?
And I mean to recall that CS3 could work slower on ppc then universal machines?