Stopping and/or pausing the process for separate files?

[Hyperseeker]

Some files – particularly large .PNGs – take a long time to process completely. The process takes up a lot of CPU on my laptop (low-level, student-grade, $300-range), and I imagine I'm not the only one with such software in need of image optimization.

Is it possible to have the process halt completely and/or pause? If so, I imagine the "in process" icon would be a good place for that.

Also: perhaps add a setting to not launch optimization immediately after adding an image? With it enabled, you could add the "commence optimization" button – like a play icon – where the loading circle would be.