Hello, @Sven when you set a limit on the configuration (example 50 send, then pause 30 minutes).
Why not look for new links in those 30 minutes? I noticed that there was 0% CPU usage and only 120Mb / ram when it was in verification status (P).
So I assumed that the whole process is inactive? However, I'm not 100% sure, but if it is, I think it would be interesting if in that break you could check the links, or even more interesting is to look for new sites.