Speedup the RSpec test suite feedback cycle
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=26759) </details> <!--IssueSummary end--> The tests running speed is pretty low. `spring` speeds up things but the situation seems far from perfect (comparing to nowadays feedback speed for, for instance, FE test suites like Jest). I was thinking of: - using different preloader (from my experience, [`Zeus`](https://github.com/burke/zeus) is more performant but I'm not sure if this project is alive) - using test watcher like [`Guard`](https://github.com/guard/guard) and [`guard-rspec`](https://github.com/guard/guard-rspec) - turning off the SASS compilation for the view specs - etc. This issue is for the discussion and sharing thoughts on the performance of the test suite and its feedback speed.
issue