Perf regression: fortunes_ef, json_middleware, updates

| Scenario | Environment | Date | Old RPS | New RPS | Change | Deviation | StDev | Dependencies |
| -------- | ----------- | ---- | ------- | ------- | ------ | --------- | ----- | ------------ |
| fortunes_ef | Fortunes EF 20- Trends Database cobalt-hosted-lin-28 | 08/23/2026 23:42:46 | 135,977 | 128,524 | -5.48 % (-7,453) :thumbsdown: | -2.70 σ | 2,756.47 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-rc.1.26413.103` -> `11.0.0-rc.2.26422.106` https://github.com/dotnet/dotnet/compare/b8c18a5c2f5d06efdd635120822953728b21678e...c545c4e3f9e2ebc10c6b3e2626187e18569adcf2 Microsoft.AspNetCore.App `11.0.0-rc.1.26413.103` -> `11.0.0-rc.2.26422.106` https://github.com/dotnet/dotnet/compare/b8c18a5c2f5d06efdd635120822953728b21678e...c545c4e3f9e2ebc10c6b3e2626187e18569adcf2 Microsoft.NETCore.App `11.0.0-rc.1.26413.103` -> `11.0.0-rc.2.26422.106` https://github.com/dotnet/dotnet/compare/b8c18a5c2f5d06efdd635120822953728b21678e...c545c4e3f9e2ebc10c6b3e2626187e18569adcf2 |
| json_middleware | Json 400k 9- Trends cobalt-cloud-lin-azl3-dual | 08/25/2026 12:37:23 | 3,683 | 3,677 | -0.17 % (-6) :thumbsdown: | -3.15 σ | 1.94 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-rc.2.26422.106` -> `11.0.0-rc.2.26424.117` https://github.com/dotnet/dotnet/compare/c545c4e3f9e2ebc10c6b3e2626187e18569adcf2...bf3289d05dff3962cdccb0e81b5315990e5b1198 Microsoft.AspNetCore.App `11.0.0-rc.2.26422.106` -> `11.0.0-rc.2.26424.117` https://github.com/dotnet/dotnet/compare/c545c4e3f9e2ebc10c6b3e2626187e18569adcf2...bf3289d05dff3962cdccb0e81b5315990e5b1198 Microsoft.NETCore.App `11.0.0-rc.2.26422.106` -> `11.0.0-rc.2.26424.117` https://github.com/dotnet/dotnet/compare/c545c4e3f9e2ebc10c6b3e2626187e18569adcf2...bf3289d05dff3962cdccb0e81b5315990e5b1198 |
| updates | Updates Platform 8- Trends Database gold-win | 08/26/2026 04:18:37 | 41,483 | 40,894 | -1.42 % (-590) :thumbsdown: | -2.18 σ | 270.41 | Changes NameVersionDiff Microsoft.AspNetCore.Antiforgery.dll `11.0.0-rc.2.26423.104` -> `11.0.0-rc.2.26424.117` https://github.com/dotnet/dotnet/compare/d706173016a4c72560d8563596f47e835a7b4093...bf3289d05dff3962cdccb0e81b5315990e5b1198 Microsoft.AspNetCore.App `11.0.0-rc.2.26423.104` -> `11.0.0-rc.2.26424.117` https://github.com/dotnet/dotnet/compare/d706173016a4c72560d8563596f47e835a7b4093...bf3289d05dff3962cdccb0e81b5315990e5b1198 Microsoft.NETCore.App `11.0.0-rc.2.26423.104` -> `11.0.0-rc.2.26424.117` https://github.com/dotnet/dotnet/compare/d706173016a4c72560d8563596f47e835a7b4093...bf3289d05dff3962cdccb0e81b5315990e5b1198 |

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

@sebastienros

Start with the PowerBI Dashboard and compare the fortunes_ef, json_middleware, and updates benchmark runs across the listed dependency revisions. Investigate the changes between the linked dotnet commits and reproduce the reported measurements if possible. Done means identifying the source of the regression and confirming that the affected benchmark results no longer regress.

Written by the indexing model from the issue text.