Windows seems to rely on disk accesses in a lot of critical processes which is why it tends to have GUI lockups and slowdowns under I/O load. Even opening task

Windows seems to rely on disk accesses in a lot of critical processes which is why it tends to have GUI lockups and slowdowns under I/O load. Even opening task manager, or just switching tabs in it, while the system is loaded can take a few seconds (~dozens to hundreds of billions of cycles).