Perf regression: fortunes_ef, json, json_middleware

| Scenario | Environment | Date | Old RPS | New RPS | Change | Deviation | StDev | Dependencies |
| -------- | ----------- | ---- | ------- | ------- | ------ | --------- | ----- | ------------ |
| fortunes_ef | Fortunes EF 20- Trends Database cobalt-hosted-lin-azl3-28 | 07/30/2026 23:47:21 | 139,831 | 95,773 | -31.51 % (-44,059) :thumbsdown: | -2.29 σ | 19,238.70 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-rc.1.26378.118` -> `11.0.0-rc.1.26380.103` https://github.com/dotnet/dotnet/compare/43cdb1f62dde1df80d5f9c3532c8cfacbbc40f53...bfb5366c2c6e45c00cd194bc21c623d32fcd4066 Microsoft.AspNetCore.App `11.0.0-rc.1.26378.118` -> `11.0.0-rc.1.26380.103` https://github.com/dotnet/dotnet/compare/43cdb1f62dde1df80d5f9c3532c8cfacbbc40f53...bfb5366c2c6e45c00cd194bc21c623d32fcd4066 Microsoft.NETCore.App `11.0.0-rc.1.26378.118` -> `11.0.0-rc.1.26380.103` https://github.com/dotnet/dotnet/compare/43cdb1f62dde1df80d5f9c3532c8cfacbbc40f53...bfb5366c2c6e45c00cd194bc21c623d32fcd4066 |
| json | Json Minimal APIs 13- Trends cobalt-hosted-lin | 08/01/2026 08:22:53 | 738,307 | 280,166 | -62.05 % (-458,141) :thumbsdown: | -3.09 σ | 148,260.95 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-rc.1.26380.103` -> `11.0.0-rc.1.26381.101` https://github.com/dotnet/dotnet/compare/bfb5366c2c6e45c00cd194bc21c623d32fcd4066...45ee027fe6e3e41dfe3c747563bb5bf728768b97 Microsoft.AspNetCore.App `11.0.0-rc.1.26380.103` -> `11.0.0-rc.1.26381.101` https://github.com/dotnet/dotnet/compare/bfb5366c2c6e45c00cd194bc21c623d32fcd4066...45ee027fe6e3e41dfe3c747563bb5bf728768b97 Microsoft.NETCore.App `11.0.0-rc.1.26380.103` -> `11.0.0-rc.1.26381.101` https://github.com/dotnet/dotnet/compare/bfb5366c2c6e45c00cd194bc21c623d32fcd4066...45ee027fe6e3e41dfe3c747563bb5bf728768b97 |
| json_middleware | Json 5M 13- Trends cobalt-hosted-lin | 08/01/2026 08:23:48 | 1,258 | 406 | -67.71 % (-852) :thumbsdown: | -5.32 σ | 160.27 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-rc.1.26380.103` -> `11.0.0-rc.1.26381.101` https://github.com/dotnet/dotnet/compare/bfb5366c2c6e45c00cd194bc21c623d32fcd4066...45ee027fe6e3e41dfe3c747563bb5bf728768b97 Microsoft.AspNetCore.App `11.0.0-rc.1.26380.103` -> `11.0.0-rc.1.26381.101` https://github.com/dotnet/dotnet/compare/bfb5366c2c6e45c00cd194bc21c623d32fcd4066...45ee027fe6e3e41dfe3c747563bb5bf728768b97 Microsoft.NETCore.App `11.0.0-rc.1.26380.103` -> `11.0.0-rc.1.26381.101` https://github.com/dotnet/dotnet/compare/bfb5366c2c6e45c00cd194bc21c623d32fcd4066...45ee027fe6e3e41dfe3c747563bb5bf728768b97 |

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

@sebastienros

No source file or test is named. Start with the fortunes_ef, json, and json_middleware benchmark scenarios and inspect the linked PowerBI dashboard and dependency version comparisons. Done means identifying the change responsible for the regression and demonstrating that the affected benchmark results recover.

Written by the indexing model from the issue text.