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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...

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

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

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