Sliding emails to subfolders

Sliding emails to subfolders

Hello, 

Is that just an impression or is it more difficult to organize emails when we we want to slide them from Inbox to Subfolders? 
I have noticed that a few days ago now and it is annoying. Before that, we could slide them very easily and we would not have to wait 3/4 seconds, holding them above the destination folder in order that their emails are well dropped there. If we release the mouse button to quickly, nothing happens and the emails stay in the original folder. 

Regards,

Olivier