Regarding graphics, CBQN is not very suited to doing these natively as it runs on the CPU rather than GPU and has only double-precision and not single-precision floats. So, can you do some simple animation at 60FPS? Probably. Can you make a competitive game engine with it? Definitely not. A few programmers are doing games using Brian's FFI raylib bindings (https://github.com/Brian-ED/rayed-bqn), see in particular David Zwitser's videos on Astroids and Snake at https://www.youtube.com/@davidzwitser/videos. And we have nice FFI docs now: https://mlochbaum.github.io/BQN/doc/ffi.html!
(Everybody seems to assume "high performance" automatically means in whatever domain they work in. Impossible to interpret these sorts of questions. Try "Will BQN have high performance for ...?" instead.)