[performance] Regression in CompileMCPWorkflow: +20.1% slower #24254
Description
📊 Performance Regression Detected
BenchmarkCompileMCPWorkflow is 20.1% slower than the recent historical average (last 7 runs).
Key Metrics
| Metric | Value |
|---|---|
| Current | 9,769,572 ns/op (~9.8ms) |
| Historical Average (7-run) | ~8,136,617 ns/op (~8.1ms) |
| Change | +20.1% slower |
| Historical Data Points | 13 |
📈 Historical Trend for CompileMCPWorkflow
| Date | ns/op |
|---|---|
| 2026-03-22 | 8,146,212 |
| 2026-03-23 | 6,808,130 |
| 2026-03-24 | 7,831,997 |
| 2026-03-31 | 5,668,083 |
| 2026-04-01 | 6,157,630 |
| 2026-04-02 | 4,942,122 |
| 2026-04-03 (current) | 9,769,572 |
Note: Values prior to 2026-03-22 were 15–17ms range; a significant optimization dropped them to ~5–8ms. Today's value represents a partial regression relative to that improved baseline.
📋 Full Benchmark Context (2026-04-03)
| Benchmark | ns/op | Change |
|---|---|---|
| CompileSimpleWorkflow | 6,578,959 | ✨ −39.6% |
| CompileComplexWorkflow | 9,456,182 | ✓ −0.8% |
| CompileMCPWorkflow | 9,769,572 | |
| CompileMemoryUsage | 7,860,516 | ✨ −9.6% |
| ParseWorkflow | 976,922 | ✨ −45.4% |
| Validation | 1,769,602 | ✨ −35.3% |
| YAMLGeneration | 4,509,263 | ✨ −28.9% |
| ExtractWorkflowNameFromFile | 11,371 | ✨ −28.1% |
| FindIncludesInContent | 26,098 | ✨ −24.2% |
💡 Recommended Actions
- Review recent changes to MCP workflow compilation (toolset handling, MCP server config parsing)
- Run
make bench-memoryto generate memory profiles for MCP compilation - Use
go tool pprofto identify hotspots in MCP-specific code paths - Compare with previous results using
benchstat - Re-run benchmarks to confirm (benchmark variance is expected on CI runners)
⚠️ Note on Significance
The performance baseline was established after March 22. This run's value (9.8ms) is notably higher than the recent 4.9–8.1ms range. Verify whether this is a real regression or runner variance by checking subsequent daily runs.
References:
Generated by Daily CLI Performance Agent · ● 805.1K · ◷
- expires on Apr 5, 2026, 5:48 AM UTC
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