That's interesting - 200kB should not be a big deal for it - maybe it uses something that I usually don't, like many function calls, or insane number of branches, etc... I would be interested in that case, but I'm not sure whether I would be able to blindly improve AsmJit without a comprehensive test.
Definitely good to know though. When it comes to low-latency compilation my personal goal is to make it even faster when generating small functions.