Even on my underpowered laptop (AMD Ryzen 7 5700U without a graphics card), PL10 runs smoothly and stably while I’m editing.
Of course, I haven’t enabled either “high quality preview” or “deep prime.” Just to clarify: I still see the same high-quality preview image, just with a slight delay; to be honest, I didn’t even notice this delay as a problem.
As I already mentioned in the thread about performance, PL10 is a big step up from PL8, and I can’t complain about any lack of performance: