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It's not, but this is a thing people have said since the early days of Java which is still going around the internet. I personally use Java every day and have yet to hear someone complain about the speed of our backends.That's because for backends it doesn't matter. The DB layer or network will hide any slowdown anyway.
But for Desktop apps the latency due to GUI overhead and GC pauses can be from mildly annoying to unbearable.