Perf regression: json, json, mvc

| Scenario | Environment | Date | Old RPS | New RPS | Change | Deviation | StDev | Dependencies |
| -------- | ----------- | ---- | ------- | ------- | ------ | --------- | ----- | ------------ |
| json | Json 9- Trends cobalt-cloud-lin | 06/28/2026 09:21:14 | 186,113 | 177,906 | -4.41 % (-8,207) :thumbsdown: | -3.71 σ | 2,210.15 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f Microsoft.AspNetCore.App `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f Microsoft.NETCore.App `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f |
| json | Json 9- Trends cobalt-cloud-lin-azl3-dual | 06/28/2026 09:21:23 | 193,848 | 176,710 | -8.84 % (-17,138) :thumbsdown: | -4.05 σ | 4,234.31 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f Microsoft.AspNetCore.App `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f Microsoft.NETCore.App `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f |
| mvc | Json Mvc 9- Trends cobalt-cloud-lin | 06/28/2026 09:23:49 | 129,864 | 123,202 | -5.13 % (-6,662) :thumbsdown: | -3.46 σ | 1,922.83 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f Microsoft.AspNetCore.App `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f Microsoft.NETCore.App `11.0.0-preview.7.26325.123` -> `11.0.0-preview.7.26327.102` https://github.com/dotnet/dotnet/compare/354f8b358deba86fa37d9fca5ad80a87ac4853f3...3e328deefbd3029c2f957050c508b4faeee3d71f |

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

@sebastienros

Start with the json and mvc benchmark results in the issue, then inspect the linked dependency comparison and use the PowerBI Dashboard to correlate the regression with the reported changes. Done means identifying a reproducible cause and confirming a measurable performance recovery for the affected scenarios.

Written by the indexing model from the issue text.