Scrolling not smooth

[brusbrother]

Just moved from 521 to 640.
Is it the increased screen size or some other variable but the scrolling seems "jittery" on the 640??

 

[libra89]

There is a slight "lag" but it's only really noticeable with certain things/apps/webpages.

 

[willgill]

Mine WAS smooth a couple of days ago, but now I have a stutter. I added a couple more live tiles but nothing too intensive.