Trust Me, You Want SunOS 4.1.4 on Your Older Sun Boxes (oldsilicon.com)

We called it "slowaris" for a reason. I also loved the ipx.

SunOS 4.1.3 and 4.1.4 were darn near bulletproof on SPARCStations. They just didn't crash. Very responsive, for the day (30 years ago).