Evaluate disabling Tiered Compilation in Roslyn ServiceHub process
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@chsienki is already working on this.
Since Dec 11, 2025.
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Description
Recent performance investigations indicate that Tiered Compilation (TC) may be negatively impacting throughput for Roslyn ServiceHub scenarios. While TC reduces JIT CPU time in some cases, data from VS perf gates and ETW traces suggest significant CPU overhead during startup and build operations when TC is enabled.
Compiler process showed net improvement after disabling TC, suggesting similar benefits might apply to Roslyn ServiceHub. https://github.com/dotnet/roslyn/commit/589146c82dc01a0e5e3a997246e8fb57e571beea
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