Just did some proper testing on a reasonably complex project, looks like I was about an order of magnitude off (to be fair it was 2AM here at the time, and I wasn't reading the numbers right haha). 30-40ms is still fast enough that you don't notice for the most part though. For this specific project, it breaks down roughly like this:

- ~1ms to build the new MIR based on the editor state

- ~5ms to process/run passes on the MIR (this involves some funky graph traversal which could very likely be optimized a lot)

- ~12ms to generate LLVM IR

- ~14ms in the LLVM JIT

In a project that makes good use of groups (nodes that contain a surface inside and then expose some controls back out) I'd expect this to be lower, since we only need to perform those operations on the surfaces that change.