Perf regression: fortunes_dapper, fortunes_ef, json

| Scenario | Environment | Date | Old RPS | New RPS | Change | Deviation | StDev | Dependencies |
| -------- | ----------- | ---- | ------- | ------- | ------ | --------- | ----- | ------------ |
| fortunes_dapper | Fortunes Dapper 8- Trends Database gold-lin | 06/28/2026 09:21:29 | 499,810 | 486,574 | -2.65 % (-13,236) :thumbsdown: | -2.98 σ | 4,437.02 | 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 |
| fortunes_ef | Fortunes EF 8- Trends Database gold-lin | 06/28/2026 09:20:29 | 466,449 | 457,277 | -1.97 % (-9,173) :thumbsdown: | -5.25 σ | 1,747.31 | 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 |
| json | Json Platform Inline 9- Trends cobalt-cloud-lin | 06/26/2026 09:00:19 | 256,200 | 226,968 | -11.41 % (-29,233) :thumbsdown: | -6.43 σ | 4,543.73 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-preview.6.26323.110` -> `11.0.0-preview.7.26325.123` https://github.com/dotnet/dotnet/compare/ff45a39124929c3f7496f16420d2f0f0265252c4...354f8b358deba86fa37d9fca5ad80a87ac4853f3 Microsoft.AspNetCore.App `11.0.0-preview.6.26323.110` -> `11.0.0-preview.7.26325.123` https://github.com/dotnet/dotnet/compare/ff45a39124929c3f7496f16420d2f0f0265252c4...354f8b358deba86fa37d9fca5ad80a87ac4853f3 Microsoft.NETCore.App `11.0.0-preview.6.26323.110` -> `11.0.0-preview.7.26325.123` https://github.com/dotnet/dotnet/compare/ff45a39124929c3f7496f16420d2f0f0265252c4...354f8b358deba86fa37d9fca5ad80a87ac4853f3 |

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

@sebastienros

Start by reviewing the fortunes_dapper, fortunes_ef, and json benchmark results, the listed dependency diffs, and the linked PowerBI Dashboard. The issue does not name files, tests, an entry point, or a definition of done, so the regression must first be localized before a fix can be scoped.

Written by the indexing model from the issue text.