Programs that should start in tens of ms take several seconds to start. That's 100x.
There are lots of reasons Java is slow not related to JIT. And lots of reasons GC is slow or bloated indep. of Java.
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GC can have decent latency, higher throughput than non-GC with around ~2-3x memory usage for a much leaner language.
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Can have comparable memory usage and great latency by giving up a fair bit of throughput. It's not strictly worse.
End of conversation
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