[wingerlang]

I made ScreenMemory. Usually the performance issues happen when users have high resolution monitors (often multiple) and set it to take screenshots very often (like every 2 seconds). It's fair because that's sort of how Rewind works, but ScreenMemory is generally built with longer intervals in mind, the default is 60s. I use this on my 2016 MBP without performance issues.

I have some improvements in the pipeline for lower capture intervals though.