Comment by ndriscoll

Definitely just a Windows issue, and even there I'm sure Windows 7 (the last usable Windows) on a 10 year old computer with an SSD would still feel fairly snappy. I use Linux on a ~9 year old computer and everything except editing photos/videos is instant. I don't know whether to expect demosaicing to be faster on newer CPUs. IIRC a new CPU might have hardware decode for 10 bit 4:2:2 h265, so that would help.