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build-perf-diagnostics

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Diagnose MSBuild bottlenecks from binlog timelines and Target/Task Performance Summaries after build-perf-baseline establishes measurements. USE FOR: unknown build slowness, RAR >5s, analyzers >30% of Csc, one target >50% of build time, node utilization <80%, excessive Copy tasks, finding restore overhead. DO NOT USE FOR: known repeated-restore fixes (use eliminate-redundant-restores), initial baselines (use build-perf-baseline), incremental rebuilds (use incremental-build), parallelism tuning (use build-parallelism), non-MSBuild builds.

plugins/dotnet-msbuild/skills/build-perf-diagnostics/SKILL.md

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Network or broad shell
Last checked
Nov 9, 2026

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5,864
Repository last updated
Nov 8, 2026
License
MIT

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## Performance Analysis Methodology

1. **Generate a binlog**: `dotnet build /bl:{} -m`
2. Use the **binlog MCP server** (`Microsoft.AITools.BinlogMcp`, exposed under the `binlog` MCP namespace) which is bundled with this plugin

If the server cannot connect, use `troubleshoot-binlog-mcp` when startup repair is
wanted. If repair is blocked, declined, or unnecessary, use the replay flow below.

### Alternate flow when MCP is unavailable: binlog replay to text logs

1. **Generate a binlog**: `dotnet build /bl:{} -m`
2. **Replay to diagnostic log with performance summary**:
   ```bash
   dotnet msbuild build.binlog -noconlog -fl "-flp:v=diag;logfile=full.log;performancesummary"
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