To expand, Windows NT was originally a microkernel system where all the drivers were in userspace. This is more stable but ended up being very slow. With NT 4, they started moving drivers into the kernel and it was really buggy in the beginning. It wasn’t until NT 4 SP3 that it was usable.
NT 3.5 wasn’t too bad.
NT4 moved a lot of stuff into the kernel that wasn’t ready for prime time and we suffered for it, at least on NT Workstation.
To expand, Windows NT was originally a microkernel system where all the drivers were in userspace. This is more stable but ended up being very slow. With NT 4, they started moving drivers into the kernel and it was really buggy in the beginning. It wasn’t until NT 4 SP3 that it was usable.