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For #6931: Add caveat about slower build times in README.

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Michael Comella 2019-12-26 07:50:53 -08:00 committed by Michael Comella
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@ -94,6 +94,7 @@ If you want to analyze performance during **local development**:
- Caveats:
- debuggable has a non-trivial & variable impact on performance but is needed to take profiles.
- Random experiment opt-in & feature flags may impact performance (see [perf-frontend-issues#45](https://github.com/mozilla-mobile/perf-frontend-issues/issues/45) for mitigation).
- This is slower to build than debug builds because it does additional tasks (e.g. minification) similar to other release builds
If you want to run **performance tests/benchmarks** in automation or locally:
- Recommendation: production builds. If debuggable is required, use recommendation above but note the caveat above. If your needs are not met, please contact the front-end perf group to identify a new solution.