Performance
How do I choose a runner size?
Quick answer
Start one size above your current runner, then check CPU utilization and stop when the curve flattens.
The detail that matters
Right-sizing is worth more than most caching work and takes an afternoon. Undersized runners waste developer time; oversized ones waste money.
Your next build could be twice as fast, at half the price
Start free. Migrating away is the same one line, and we publish that diff too.
Related
Why are GitHub Actions slow?Most commonly: shared vCPU, cold caches, network-attached disk, and queue time before the job even starts.How fast do runners start after a job is queued?runnerhut runners start in about three seconds from a warm pool.Do I need to change my workflow?No. Change the runs-on label and leave everything else as it is.Why do my jobs queue behind each other?You have hit a concurrency limit — either your plan's, your runner group's, or a concurrency group in the workflow.