Hi,
I do not know if this is really a bug, but I want to mention.
I have noticed that Alt.Binz pause/freeze every three seconds for about one second when you have a huge amount of files in a collection. I recently downloaded large collection (80GB and larger) where the collection had over 1600 files. When pausing a large amount Alt.Binz stopped pausing every three seconds and download as normal. The issue starts around 500-600 active files where Alt.Binz starts pausing every three seconds for about one millisecond but still noticeable. Now, the more files you set on active the longer is the pause every three seconds. To be clear this is only for the amount of files in a single collection, not across multiple collections in the download list. Another side effect is that Alt.Binz falls behind decoding downloaded files due to the pauses.