> due to high-speed filming

The laggy footage starting at 0:28 looks like real-time to me. You can see the crosshair falling behind at 0:35 too, and that's clearly normal speed unless the guy can do handwriting in slow-motion. And I can't think of any way a high framerate would affect the perception of lag when played in realtime.

https://twitter.com/collusionapp/status/208366845781221377 for those not on a mobile phone (it was asking me to log in on the mobile subdomain but I'm already logged in on my laptop)

The hashbang is the problem, just removing it also does the trick: http://mobile.twitter.com/collusionapp/status/20836684578122...