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Java is not slow, even JS is not slow. 10% performance improvement doesn't make sense for rewrite.

Java's not slow, but IntelliJ consumes a lot of RAM. On computers with less than 8GB RAM, the constant swapping causes bad performance.

java and JS are slow, it is how they work, they are JIT'd languages running in a VM, this alone makes the program slow by default

are people in this website not supposed to be programmers? or it's too late to expect programs to be fast again?