Optimal performance settings for high mp compositing advice

Question

Any input would be greatly appreciated:I use the highest spec mac ultra studio with 192gb of ram . Scratch disks are set to theinternal ssd with over 6 TB free. As of the last two updates im experiencing some heavy slow downs when i use my brush in color blend mode and paint walls a different color. This never used to happen. I get the spinning ball and about 10 seconds later it works but not real time like it used to. Nothing in my system has changed and i haven't  added any peripherals or software that should interfere.i also havephotoshop set to use up to 80% of memory. Im an architectural photographer so the composite consist of anywhere from 5-30 layers of 100 mega pixel 16 bit tiffs. What would be the optimal performance settings as far as cache levels and tile size? Im thinking i need to do a clean install of photoshop and hopefully that fixes things.  Thanks for your time

D Fosse · Answer

I have a hunch that resetting preferences might do the trick. Don't just click "reset on quit" - nuke it completely: move the whole settings folder to your desktop.

The preferences contain a lot more than your own user settings. It's the whole application configuration, including lots of hidden parameters and parameters relating to your hardware components like the GPU. Corrupt preferences can cause strange, unpredictable and inexplicable behavior. Anything can happen.

Preferences are prone to corruption because they are rewritten on every application exit, in contrast to read-only program files. An irregular shutdown can corrupt them, small errors can accumulate. Especially if you migrate preferences from one version to the next, when to complicate things you have new application code.

Your configuration seems fine otherwise. 6 TB scratch disk is good, you may need a good portion of that. 80% memory is excellent - but 70 will work just as well and is safer. The heavy lifting will be in the scratch disk anyway.

I would not change cache levels and tile sizes, that's unlikely to be the problem. Generally the advice is large tiles for high pixel flat images and smaller tiles for many layers, but you seem to be somewhere in the middle.

Yes, you'll need to set everything up again, but that's ten minutes very well spent (save out your actions, brushes etc).

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