Admin is very, very slow compared to the store?

My Admin runs much, much slower than the front end of the website… We have about 2000 products and searches in the store are fast, as is everything else. However the admin area is painfully slow.

Is there anything obvious which might be causing this… I assume it's not a problem with the server as the main shop (with all its graphics and product images) runs fine… the speed is very noticeably slower in admin… I've tried running admin both in and out of SSL mode and it doesn't make a difference.