I use it all the time. But it sound like you have a slow system - be more patient!
When you want to Browse -
There will be a list on the left side of the collections to browse:
Click that require and it will list items available with a small orange triangle by the side of each, If you click on a Triangle it will show more info.
When you find something you want to look at - click that and an thumbnail image will show up on the right side of the page
Click that for a full page view!!

Good Luck

Tim Radford