I wwsn't familiar with this sys.monitoring option for coverage. Going to give it a try in my test suite. At the moment with docker testcontainers, gh actions test matrix for multiple python versions, and unit + regression + integration tests it is taking about 3-5 minutes.
Warning, there is a change in coverage 7.7.0 that disables sysmon support for coverage if using branch coverage _and_ a version of Python before 3.14alpha6.