Make -threaded the default
Simon M writes back in 2016
Related to this, I think it's about time we made -threaded the default. We could add a -single-threaded option to get back the old behaviour.
There is a small overhead to using -threaded, but -threaded is also required to make a lot of things work (e.g. waitForProcess in a multithreaded program, not to mention parallelism).
All that needs doing is to add a flag
-single-threaded to enable the old behaviour and a deprecation warning alerting uses that
-threaded is the new default.