How to make your builds faster

Improve productivity by optimizing your CI/CD pipelines for speed.

Advanced caching

Save time on fetching dependencies and building artifacts.

Caching dependencies - cache and restore dependencies using custom keys rather than reinstalling them each time you run a job.
Workspaces - persisting artifacts to a workspace allows downstream jobs to access them as a workflow progresses.
Docker layer caching - cache the individual layers of Docker images that you build in a CircleCI job. Unchanged layers will be restored next time you build a Docker image. This feature requires a paid plan.

More machines and more powerful machines.

Use multiple machines concurrently and increase compute power to speed up your pipelines.

Concurrency - split up your builds into multiple independent jobs and use workflows to run them simultaneously.
Parallelism - run tests in parallel by splitting your test suite across multiple machines.
Resource classes - customize the CPU and RAM for the machine running a particular job. Note that resource classes larger than medium require a paid plan.

6 ways to speed up your builds on CircleCI