Speed up "stopping" of backups

When I tell UrBackup (from the server) to stop a File or Image backup, it takes a long time to stop. Like, sometimes I think it would be faster to finish the backup than stop it.

I really think the stopping process should be sped up, and I’m not sure where the bottlenecks are. I know that it’s like stopping a freight train, but it can be upwards of like 15 minutes just to stop.