[release/10.0] Remove redundant guid parsing #120445
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MihaZupan
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Oct 6, 2025
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Backport of #120413 to release/10.0
/cc @EgorBo
Customer Impact
.NET 10.0 regressed startup time for trivial workloads as was reported by the AWS team in #120288. We suspect it's some new generic instantiations we introduced in .NET 10.0 around number parsing, since that is not easy to fix/backport, we just applied a few general improvements to regain the losses. This PR removes redundant Guid.Parse calls which had negative perf impact, e.g. this one.
Regression
Testing
This just removes an unused field and replaces Guid.ctor that parses a string with the one that doesn't (checked locally that those are the same).
Risk
Low, there should be no change in behaviour.