rspec-turbo

https://github.com/thadeu/rspec-turbo

rspec-turbo runs your RSpec suite across N processes like parallel_tests, but balances work by actual example count (from a single --dry-run) using an LPT bin-packing heuristic, splitting oversized files across workers. It ships a live TTY dashboard, a CI-friendly progress mode, schema-fingerprinted test DB setup caching, JUnit output, coverage merging, and a slowest folders/files report.