How are they ignorant? It’s a known fact that java is slow, at least slower than some others. Sure, it’s still fast enough for 95% of use cases, but most code will run faster if written in, say, C. Will have 10x the amount of code and twice as many bugs though.

[–] [email protected] 3 points 7 months ago* (last edited 7 months ago) (1 children)

Java is indeed slower than C, Rust, in some cases than Go.

But that doesn't mean that

code will run faster if written in, say, C

Again, like 80-90% of production code are bounded by disk/network io operations. You will gain performance from using C in embedded systems and in heavy calculations (games, trading, simulations) only.

[–] [email protected] 0 points 7 months ago

Which is exaxtly what I said, that it’s fast enough for most use cases.

In theory though, you will “gain performance” by rewriting it (well) in C for literally anything. Even if it’s disk/io, the actual time spent in your code will be lower, while the time spent in kernel mode will be just as long.

For example, you are running a server which reads files and returns data based on said files. The act of reading the file won’t be much faster, but if written in C, your parsers and actual logic behind what to do with the file will be.

But it’s as you said, this actual tiny performance gain isn’t worth it over development/resource cost most of the time.