Slightly off-topic, Chrome on my early-2015 MacBook (16GB RAM) lags significantly while rendering most of the demos listed in the repository. If things like this become the norm on the web, one can easily claim that such technologies are not inclusive to most users of the world-wide-web, who do not buy a new latest&greatest desktop computer every 2 years.
`mojs` definitely was created to support old and slow computers(it supports FireFox from version 4 and IE9).
The problems usually with the Chrome browser because it updates frequently and the Chromium team changes it a lot, so what was recently woking well might not work well right now. And problems like these are usually regard rendering performance and CSS transforms. So the issues you might see are related to the demos itself(not library) which were highly optimized for recent browsers' engines and those changed. I will revamp the demos shortly to keep them up to date.
Also, I often found that heavy animations work much better on mobile devices like iPhones than at my MacBook Pro mid 2012.
On a mid-2011 MBP with severe performance issues running stuff like Atom, but these animations work fine for me with zero lag. Something is wrong with your computer.
I have a Zenbook UX32LN from 2015, with 12GB RAM, elementaryOS linux installed as a system, and on Firefox they work like a charm! Try it on different browser or update chrome?
