process.hrtime

[domenic]

This is pretty easy to shim in few lines of code as seen by https://github.com/kumavis/browser-process-hrtime/blob/master/index.js . (And you can omit the browser prefixed versions.)

[calvinmetcalf]

so this gets pulled into a LOT of packages so we'd want to do it small, also this gets run in some weird environments, like without setTimeout so I may need to check what those people were doing and if they would have Math and Date available.