Finally, new upload system is in place. My website is now uploading your game folder in little chunks like it should, instead of dumping the entire file.
I really really hope you will find it faster!
Just a note though, at the time of writing this post, the progress bar will seem slightly less responsive.
Previously, the progress bar was updated for every byte being uploaded. At this very moment, its updated after every 5MB chunk of data is uploaded. So it is a bit more staggered. I will work on that anyway.