I don't know any definite benchmarks, but anecdote, the unit tests of a bigger library[1] I am writing run in 10s on net5 vs 12s on dotnet 3.1 (core) vs 17s on

I don't know any definite benchmarks, but anecdote, the unit tests of a bigger library[1] I am writing run in 10s on net5 vs 12s on dotnet 3.1 (core) vs 17s on .net48 (framework), on the same machine with warm caches, of course. That's a sizable difference. YMMV [1] not web stuff, "plain" C# essentially. It has some compute-bound things like encryption and compression and some fancy tree structures, uses a lot of linq in certain parts.