It’s OS/2 (okay ArcaOS 5.0.6) on a ThinkPad T440p!
@goossbears I set up Warp 4.5 on VirtualBox once... it wasn’t bad, but the video performance was abysmal. I should try ArcaOS instead, their updated video drivers are much better.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko