User reports of issues have cleared up as of approximately Noon PST. We apologize for the delays in resolving this issue. Please email support@travis-ci.com if you see any further issues.
Posted Mar 17, 2017 - 02:45 UTC
Update
We are seeing some reports of similar intermittent slowness from both nodejs.org and registry.yarnpkg.com from other users outside of Travis CI's infrastructure, which seems to indicate a potential upstream issue.
Restarting affected builds can help and this is recommended for the moment.
We are continuing to investigate.
Posted Mar 16, 2017 - 15:30 UTC
Investigating
We’re currently investigating slowness and connectivity issues on `sudo: false`, container-based builds. This seems to be specially affecting Node.js installations via nvm.