Deploy Artifact Speedup
Sometimes it's handy to upload many small artifact files e.g coverage reports. This runs in serial and is very slow compared to uploading one large file.
As an example, my coverage reports are 8mb/400 files. On my last build 36s was spent uploading artifacts out of a total 1:23 for the whole build.
See more: https://discuss.circleci.com/t/uploading-artifacts-recursively-is-exceptionally-slow/14558