'Why same .net program run on windows outperforms same program run on linux?

I am benchmarking some very simple non IO operations on windows-x64 and ubuntu.x64.

Given same HW, same load, etc.. Windows outperforms and runs around 30% faster.

The operations I benchmark are Json serialise/deserialise, basic and concurrent collection lookup, addition, deletion, etc..

The way I build the linux program is using command line

dotnet publish App.sln —-framework net6.0 —-configuration Release -—runtime ubuntu.20.04-x64

I have read in some blogs that this is typical and nothing to be surprised about. Can someone please confirm or deny or give a clue what’s happening?

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