Perf regression: json, kestrel-header-symbols, updates

| Scenario | Environment | Date | Old RPS | New RPS | Change | Deviation | StDev | Dependencies |
| -------- | ----------- | ---- | ------- | ------- | ------ | --------- | ----- | ------------ |
| json | Json Platform Inline 11- Trends idna-intel-lin | 08/13/2026 21:41:16 | 187,491 | 178,889 | -4.59 % (-8,602) :thumbsdown: | -2.39 σ | 3,591.99 | Changes NameVersionDiff |
| kestrel-header-symbols | Kestrel Linux: Invalid Header 11- Trends idna-intel-lin | 08/12/2026 00:23:21 | 1,390 | 1,334 | -100.00 % (-56) :thumbsdown: | -3.34 σ | 16.77 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-rc.1.26409.102` -> `11.0.0-rc.1.26410.109` https://github.com/dotnet/dotnet/compare/7fb8cef14d9ae6bd729b04638f88d00f1ba7eb99...283314d5d7f2d77d1a31087ec962a4c407106445 Microsoft.AspNetCore.App `11.0.0-rc.1.26409.102` -> `11.0.0-rc.1.26410.109` https://github.com/dotnet/dotnet/compare/7fb8cef14d9ae6bd729b04638f88d00f1ba7eb99...283314d5d7f2d77d1a31087ec962a4c407106445 Microsoft.NETCore.App `11.0.0-rc.1.26409.102` -> `11.0.0-rc.1.26410.109` https://github.com/dotnet/dotnet/compare/7fb8cef14d9ae6bd729b04638f88d00f1ba7eb99...283314d5d7f2d77d1a31087ec962a4c407106445 |
| updates | Updates Minimal APIs 8- Trends Database gold-win | 08/13/2026 12:55:23 | 32,102 | 31,769 | -1.04 % (-333) :thumbsdown: | -2.19 σ | 151.70 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-rc.1.26410.108` -> `11.0.0-rc.1.26411.119` https://github.com/dotnet/dotnet/compare/a331ec1877b0aca43d294b3d3f91af49bf403ee9...7cdb217445905f3342bbb0266a4497b9a014389a Microsoft.AspNetCore.App `11.0.0-rc.1.26410.108` -> `11.0.0-rc.1.26411.119` https://github.com/dotnet/dotnet/compare/a331ec1877b0aca43d294b3d3f91af49bf403ee9...7cdb217445905f3342bbb0266a4497b9a014389a Microsoft.NETCore.App `11.0.0-rc.1.26410.108` -> `11.0.0-rc.1.26411.119` https://github.com/dotnet/dotnet/compare/a331ec1877b0aca43d294b3d3f91af49bf403ee9...7cdb217445905f3342bbb0266a4497b9a014389a |

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

@sebastienros

Start with the reported json, kestrel-header-symbols, and updates benchmark scenarios, then inspect the linked dependency comparisons and the ASP.NET benchmarks PowerBI dashboard. Done means identifying the change responsible for the regression and confirming the affected benchmark results recover.

Written by the indexing model from the issue text.