Perf improvement: kestrel-hostheader-mismatch, tls-renegotiation-kestrel

| Scenario | Environment | Date | Old RPS | New RPS | Change | Deviation | StDev | Dependencies |
| -------- | ----------- | ---- | ------- | ------- | ------ | --------- | ----- | ------------ |
| kestrel-hostheader-mismatch | Kestrel Linux: Host Header Mismatch 11- Trends idna-intel-lin | 06/24/2026 22:57:02 | 65,600 | 70,165 | 6.96 % (4,565) :thumbsup: | 3.30 σ | 1,381.43 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-preview.6.26322.111` -> `11.0.0-preview.6.26323.115` https://github.com/dotnet/dotnet/compare/d8addc1562ad98c7cab19ed654e9caabd1112d87...fb43ff15847a6821ac4f3cb5b2581076124a06df Microsoft.AspNetCore.App `11.0.0-preview.6.26322.111` -> `11.0.0-preview.6.26323.115` https://github.com/dotnet/dotnet/compare/d8addc1562ad98c7cab19ed654e9caabd1112d87...fb43ff15847a6821ac4f3cb5b2581076124a06df Microsoft.NETCore.App `11.0.0-preview.6.26322.111` -> `11.0.0-preview.6.26323.115` https://github.com/dotnet/dotnet/compare/d8addc1562ad98c7cab19ed654e9caabd1112d87...fb43ff15847a6821ac4f3cb5b2581076124a06df |
| tls-renegotiation-kestrel [Fixed] | Kestrel Linux: TLS Renegotiation 9- Trends cobalt-cloud-lin | 06/26/2026 20:19:26 | 902 | 915 | 0.00 % (13) :thumbsup: | 3.14 σ | 4.14 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-preview.7.26324.112` -> `11.0.0-preview.7.26325.123` https://github.com/dotnet/dotnet/compare/41b5d5408ece9441d251840e91d5b20b38b958c0...354f8b358deba86fa37d9fca5ad80a87ac4853f3 Microsoft.AspNetCore.App `11.0.0-preview.7.26324.112` -> `11.0.0-preview.7.26325.123` https://github.com/dotnet/dotnet/compare/41b5d5408ece9441d251840e91d5b20b38b958c0...354f8b358deba86fa37d9fca5ad80a87ac4853f3 Microsoft.NETCore.App `11.0.0-preview.7.26324.112` -> `11.0.0-preview.7.26325.123` https://github.com/dotnet/dotnet/compare/41b5d5408ece9441d251840e91d5b20b38b958c0...354f8b358deba86fa37d9fca5ad80a87ac4853f3 |

[PowerBI Dashboard](https://aka.ms/aspnet/benchmarks)

@sebastienros

Start with the PowerBI Dashboard and the kestrel-hostheader-mismatch and tls-renegotiation-kestrel benchmark scenarios listed in the issue. Compare the reported RPS and dependency revisions, then identify a concrete, reproducible performance change and its success criteria before attempting implementation.

Written by the indexing model from the issue text.