Tool Perf Regression
Category: Performance · Tier: All
Detect performance regression against a baseline. Uses dual thresholds: both percentage AND absolute change must be exceeded.
Profiles: strict (perf envs, FCP 10%/50ms), normal (default, FCP 20%/100ms), ci (pipelines, FCP 25%/150ms), lenient (dev, FCP 30%/200ms).
When to Use
Compare current metrics against stored baselines. Detect regressions across deploys.
Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
| url | string | Yes | URL to test |
| baselineName | string | Yes | Name of baseline to compare against |
| sensitivity | string | No | Sensitivity profile: strict (perf testing), normal (local dev), ci (automated pipelines), lenient (development) |
| thresholdLcp | number | No | Override LCP threshold percentage |
Example
Check if the latest deploy slowed down any pages
Tips
- Combine with other tools for full analysis
Research
- Core Web Vitals — LCP, FID, CLS metrics
Related
- Tools Overview — All 120 tools by category