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> Framebuffer graphics, working Xorg with mouse & keyboard

How performant it is? Does it feel usable on a mediocre host PC?

Yes of course. I've not tested modern DEs because the emulator is still RV32-only, but xterm with twm works very good.

It's still works with interpreter with 1/3 of QEMU performance. With JIT (which is still WIP) it'll be even faster.

Twm is slow on rendering. Choose fvwm, ctwm or cwm.

Source: I tried it on OpenBSD on a "moderm" machine (2007_ and with a medium-high load you could see redraws going on.

This never happened to me with FVWM or CTWM.