Precisely, fun is the operative word. As I was writing I was thinking that perhaps you would still need to run client-side non-layout JS, however, "attention is all you need": it seems that there are some architectures for Turing complete neural networks [1].

I wouldn't worry about performance: Nvidia breaks world records with H100 [2], Intel is going for 6 GHz processors [3], for performance you just have to be patient.

[1] 2019, Jorge Pérez et. al, On the Turing Completeness of Modern Neural Network Architectures, https://arxiv.org/pdf/1901.03429.pdf

[2] https://blogs.nvidia.com/blog/2022/09/08/hopper-mlperf-infer...

[3] https://www.tomshardware.com/news/intel-teases-8-ghz-raptor-...