I've already posted this comment in the forum topic "Collections", but no one seems to have noticed yet. Now, I creat this new topic, because I think there might be some more users having the same problems like me:
In one of my collections, I've already got 50+ items. Now, when trying to edit it or add even just one single new item, that doesn't work because it always says: "Could not load site." I guess, one of the reasons is that the site has to recount all the items that are already on the list...
Autosaving (like in songs/translations/comments); separating into several pages (like here in the forum topics when there are multiple entries); hiding all items that had been added earlier (like when translating a song, you don't see the other translations)
I'm not sure if any of my suggestions could work, but I'd be glad to get a response.