There have been a large number of Performance Improvements in .NET 6 as evidenced in Stephen Toub’s blog post. Most of the time we don’t care about assembly level performance optimisations because the bottleneck is usually accessing some external resource, such as a database or web service.
If you need to benchmark .NET code take a look at a great tool, BenchmarkDotNet and also take a look at the book referenced there, Pro .NET Benchmarking as getting benchmarking correct can sometimes be quite tricky.
If you’re not yet on .NET 6, and you have code in a large loop that you want to squeeze some performance out of it (and it won’t make the code hard to understand and maintain!) here are a couple of simple tips:
- Testing if n is even: replace
(n % 2 == 0)with((n & 1) == 0) - Dividing by 2: replace
n / 2byn >> 1(but be aware of the unsigned / signed behaviour of right shift)