internet explorer for me definitely is a LOT slower than firefox, but even in firefox at times, the overview is a lot slower then what it, IMHO, could be... but what the heck. it works.
Thank you for your answers. I use exclusively firefox under linux. What is very slow is the overview. Jumping from image to image through "previous" and "next" is quite fast, but from a set of 20 images to the next set is very slow (about 10 to 20 seconds).
I come back on my own question. I just found the new display options allowing to display only the last 30 days movies (I know I am slow too). Now it is very quick, even when asking for 100 movies per page. The problem came probably from the selection among 10000+ movies.