Hmm, at least it's not just me then. For sure it didn't used to be this way, but for some time now it seems to hang for around 5 mins at the end then continue.
I've checked the whole list manualy and removed all dead items. These may have caused a delay as instead of the small xml the whole (404)-page is fetched, some even time out.
Please clean the cache and try again to see if this has any effect. Downloading and processing takes ~20-25 secs here.
All my installed plugins have disappreared in the list "installed".
They now appear within the list "all plugins"
Corrupted database? if this is the fact, where do i find this database and how can it be repeared?