It looks beautiful and very easy to use, except for the one fact: the whole UI is quite slow in my browser (Firefox 27 on Linux Mint). Maybe it's my laptop, it'

It looks beautiful and very easy to use, except for the one fact: the whole UI is quite slow in my browser (Firefox 27 on Linux Mint). Maybe it's my laptop, it's 2 years old, but I don't see anything on the screen warranting this sluggishness...