Polyfills missing requestAnimationFrame/cancelAnimationFrame API in legacy browsers.
This is, as far as I know, the only one that implements callback queueing/dequeuing and simultaneous execution.
Other requestAnimationFrame polyfills, again AFAIK, are operating by doing it's best to calculate dynamic next frame time for each callback and thus scheduling each callback execution separately.
This requestAnimationFrame polyfill queues callback for single next-frame execution.
Theoretically it should be. Single call to queued functions is expected to perform better than multiple setTimeout functions trying to target the same moment.
Drop minified version (836bytes) somewhere in the code before first use of requestAnimationFrame.