multi-platform docker builds are slow mostly because of qemu emulation. depot runs native amd64 and arm64 builders instead. wito shows a build drop from ~30 minutes to 16 seconds.
the github control plane goes down and your jobs never dispatch, so all your ci redundancy is moot. luke walked through how depot ci runs github actions workflows without it, keeping runs alive through outages.
we had some fun and built a benchmark that computes the 20th fibonacci number by running each of its 18 steps in its own ci runner. each step takes about a second, so what you're really watching is the runner start up.
