Code review comment for ~cjwatson/launchpad:drop-py35

> Just `bin/with-xvfb bin/test -vvc` in a focal container after the usual container setup. No parallelization. (I expect it would go faster with at least a little parallelization.)

I am pleasantly surprised at how faster the Ryzen CPU on your new laptop is, compared to the 8th-gen mobile i5 on mine!