I wanted to say that the per-developer output has not slowed down significantly. But I admit that there are challenges. For example startup time is ~30 seconds

I wanted to say that the per-developer output has not slowed down significantly. But I admit that there are challenges. For example startup time is ~30 seconds because that's the time it takes to import everything. This automatically means that running even a single test will take at least 30 seconds, to not bang your head against the wall we mostly write new code in a REPL so everything is already loaded.