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

Dakkaron · Dec 26, 2019 · 24f1846 · 24f1846
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diff --git a/README.md b/README.md
@@ -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.