This seems very sluggish in my browser (Firefox 17.0.1). There's about half a second of lag, which is far too long. It also took me a while to realise that I h

This seems very sluggish in my browser (Firefox 17.0.1). There's about half a second of lag, which is far too long. It also took me a while to realise that I had to drag the handle instead of just being able to click in the bar where I wanted it and slide from there, although this is presumably easy to fix.