From 12832276572aa3ec8c91efdb8db0a6e02985ae7f Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Mon, 12 Jan 2026 01:16:03 +0000
Subject: [PATCH] perf: remove telemetry overhead from benchmark projects

Benchmark projects now reference TUnit.Engine and TUnit.Assertions
directly instead of the TUnit metapackage, which includes:
- Microsoft.Testing.Extensions.Telemetry (AppInsights)
- Microsoft.Testing.Extensions.CodeCoverage
- Microsoft.Testing.Extensions.TrxReport

This eliminates ~35-40% overhead in single test execution benchmarks
caused by telemetry initialization (AppInsights background threads,
I/O completion port waiting).

Measured improvement:
- Before: ~565ms for single test execution
- After: ~370ms for single test execution

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 .../TUnit.PerformanceBenchmarks.csproj                       | 4 +++-
 tools/speed-comparison/UnifiedTests/UnifiedTests.csproj      | 5 +++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/TUnit.PerformanceBenchmarks/TUnit.PerformanceBenchmarks.csproj b/TUnit.PerformanceBenchmarks/TUnit.PerformanceBenchmarks.csproj
index e1cfab4ef0..e86a8dcf84 100644
--- a/TUnit.PerformanceBenchmarks/TUnit.PerformanceBenchmarks.csproj
+++ b/TUnit.PerformanceBenchmarks/TUnit.PerformanceBenchmarks.csproj
@@ -14,7 +14,9 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <ProjectReference Include="..\TUnit\TUnit.csproj" />
+        <!-- Use direct references to avoid telemetry/code coverage overhead in benchmarks -->
+        <ProjectReference Include="..\TUnit.Engine\TUnit.Engine.csproj" />
+        <ProjectReference Include="..\TUnit.Assertions\TUnit.Assertions.csproj" />
         <ProjectReference Include="..\TUnit.Core.SourceGenerator\TUnit.Core.SourceGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
     </ItemGroup>
 
diff --git a/tools/speed-comparison/UnifiedTests/UnifiedTests.csproj b/tools/speed-comparison/UnifiedTests/UnifiedTests.csproj
index 6bbfc661e7..8996d34283 100644
--- a/tools/speed-comparison/UnifiedTests/UnifiedTests.csproj
+++ b/tools/speed-comparison/UnifiedTests/UnifiedTests.csproj
@@ -37,9 +37,10 @@
         <IntermediateOutputPath>obj\$(Configuration)-$(TestFramework)\$(TargetFramework)\</IntermediateOutputPath>
     </PropertyGroup>
 
-    <!-- TUnit packages -->
+    <!-- TUnit packages - use direct references to avoid telemetry/code coverage overhead in benchmarks -->
     <ItemGroup Condition="'$(TestFramework)' == 'TUNIT'">
-        <PackageReference Include="TUnit" />
+        <ProjectReference Include="..\..\..\TUnit.Engine\TUnit.Engine.csproj" />
+        <ProjectReference Include="..\..\..\TUnit.Assertions\TUnit.Assertions.csproj" />
     </ItemGroup>
 
     <!-- xUnit v3 packages -->