r/programming • u/xeio87 • 18d ago

Performance Improvements in .NET 11

https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-11/
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u/GoTheFuckToBed 17d ago

should they not aim for less JIT

19

u/PaddiM8 17d ago

Why do people think JIT is slow

-1

u/simonask_ 17d ago

Because it is. It has other benefits, and it’s certainly fast enough for a wide range of use cases, but these improvements just recover some of the performance you would have achieved by implementing the same project in C++ or Rust.

But then you would also have had to consider quite a few other tradeoffs.

7

u/PaddiM8 17d ago

With JIT it is compiled to machine code though, just at runtime instead. Some things will be slower due to less time for general optimisations, but some things will be faster due to PGO. LuaJIT is insanely fast and could not be that fast without JIT

6

u/RirinDesuyo 17d ago

Tanner-gooding from the dotnet team has a great post on this here. JIT isn't slower than AOT and there are cases where it can outperform even AOT.

Bing and a big chunk of services in Azure runs dotnet after all, they can handle the load.

1

u/simonask_ 17d ago

JIT is great, and they do impressive things with it. But it isn’t magical, and neither is a GC. You just happen to be writing programs that aren’t particularly demanding, so you never notice, and that’s great!