Given that the disk is several orders of magnitude slower that the RAM, lazily re-loading pages from the disk to the memory can induce very visible and annoying

Given that the disk is several orders of magnitude slower that the RAM, lazily re-loading pages from the disk to the memory can induce very visible and annoying loading delays everywhere (e.g. change tab in browser takes 3 sec). I'd rather wait 10 extra second than having a slow computer for the next 10 minutes.