Perf improvement: json

[pr-benchmarks]

Scenario	Environment	Date	Old RPS	New RPS	Change	Deviation	StDev	Dependencies
json	Json 14- Trends cobalt-hosted-lin-28	07/06/2026 10:18:35	321,424	464,699	44.58 % (143,275) 👍	2.19 σ	65,484.44	Changes Name Version Diff Microsoft.AspNetCore.Antiforgery.dll 11.0.0-preview.7.26354.101 -> 11.0.0-preview.7.26355.102 dotnet/dotnet@02385e2...b4b350a Microsoft.AspNetCore.App 11.0.0-preview.7.26354.101 -> 11.0.0-preview.7.26355.102 dotnet/dotnet@02385e2...b4b350a Microsoft.NETCore.App 11.0.0-preview.7.26354.101 -> 11.0.0-preview.7.26355.102 dotnet/dotnet@02385e2...b4b350a

PowerBI Dashboard

@sebastienros

[korudovepo56]

fix_rps_spike.zip
Man, that massive RPS spike was driving me nuts. Turns out that preview build for Antiforgery had a nasty memory leak in the middleware. I put together a quick script to roll back the specific dll versions and stabilize the cobalt host.