Does increasing history states (number of undos) affect performance in Photoshop?

Luckily I have a good computer, so I always have my states at the maximum. 

But for those with lesser computers.... that can be an issue.

Hi

D_Fosse's answer is correct. Here is Adobe's Help file on history states and performance:

https://helpx.adobe.com/photoshop/kb/optimize-photoshop-cc-performance.html

~ Jane

It very rapidly increases the scratch disk requirement. Every history state can potentially demand another full original file size.

For most "normal" uses, 200 - 400 GB free disk space for the scratch file should be sufficient. But with a lot of history states, say, 50 and upwards - make sure you have the disk space for it.