[nailer]

Man PSP 5 was fantastic. Learning photo manipulation on PSP, and comparing it to the slow, laggy, unintuitive mess that Photoshop seemed to be, I'm still not convinced that Adobe products actually work to this day. Obviously other people have better experiences with Adobe, but I also suspect they're more tolerant to slower UIs.

[teh_klev]

I had a (ahem, cough, shh) hooky copy of Photoshop back in the mid 2000's but always got frustrated with it and reverted back to PSP. PSP always made more sense to my non-graphics designer brain.

[PeterMikhailov]

All of the anti counterfeiting US currency code in PS probably slows it down.

[mark-r]

The same code is in PSP, and it only slows down specific operations.