In base.js there is `var performance = performance || {};`. In IE and Safari
the `var performance` is initialized as `undefined` which overwrites the
built-in `performance` object and causes them to use the `Date.now` fallback
which can cost them on the benchmark. A way to avoid this is to do a simple
`typeof` check. `if (typeof performance == 'undefined') performance = {};`.
Original issue reported on code.google.com by John.Dav...@gmail.com on 30 Oct 2014 at 10:18
Original issue reported on code.google.com by
John.Dav...@gmail.com
on 30 Oct 2014 at 10:18