while GC certainly can use some improvement, I suspect this may not be harder than C++ overall because writing the whole application (for trading) C++ means you have to “work hard” manually everywhere. Considering https://www.researchgate.net/publication/331983442_Julia_for_robotics_simulation_and_real-time_control_in_a_high-level_programming_language was possible, I’d say if you can dive deep for the latency critical part of your code to make it not invoke GC when you don’t want it to, you can retain the pleasant high-level programming for most part and get good latency for the inner most logic
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