Comment by DavidWilkinson

The Python simulations we run in-browser are indeed using Pyodide in part! It's brilliant, but there's quite a performance penalty at present. We're working on some optimizations, but right now running the engine locally or offloading to the cloud are the only places real scale can be achieved. That said we're thrilled that Python-in-browser is possible at all, and excited at how many high-quality complementary projects are in the works. It really does feel like "everything is coming together" :)