[lucideer]

There's no javascript on the page at all (with the exception of two IE-compat scripts). The CSS also looks tame enough - a data uri, -webkit-font-smoothing and one Google web font are the only vaguely notable things.

Could be a browser bug on your system? (I see no lag of any kind)

[userbinator]

There's also this script:

http://htty.github.io/htty/javascripts/scale.fix.js

which appears to add a 'gesturestart' event, and a weird conditional comment at the bottom that shouldn't appear for non-IE, but whose condition is to explicitly run the function defined in that script in non-IE browsers...

[manojlds]

I get the lag too. MBP 15" Late 2014.

[Killswitch]

No lag here, Mid 2015 MBP 15" driving 2 27" Thunderbolts.

[ryanlol]

Definitely lagging here, brand new 12" macbook running chrome.