when you set a limit in settings (example 50 submission, then pause 30 minutes).
Why not search in those 30 minutes for new links? I noticed there was 0% cpu usage and only 120Mb/ram when it was on verify (P) status.
so I assumed the entire process is idle? not 100% sure though, but if it is, I think it would be interesting if in that break it could verify links, or even more interesting is search new sites.