One reason we care about containers taking seconds to start is that our CI tests have to start and stop a lot of containers, and it all adds up. And running the

One reason we care about containers taking seconds to start is that our CI tests have to start and stop a lot of containers, and it all adds up. And running them in parallel wouldn't help because they would just bottleneck on the global docker daemon... or break entirely by interfering with each other, unless we run multiple Docker-in-Docker setups, which would be even more painful and add its own overhead.