[zuzun]

When I open a Tweet I look at spinner animations for 10 seconds. Scrolling is also the opposite of smooth.

[benbristow]

Scrolling is silky smooth for me and spinners go away quickly.

What hardware are you running?

[zuzun]

For their infinite scrolling, they clean the DOM above and below the viewport and only keep a certain amount of tweets rendered. So once you start scrolling a little faster, the JavaScript can't keep pace and starts sputtering.