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Yes, I got to witness the same symptoms with qB v4.2.5 as you describe, Mr. Camponotus – all connections are really sluggish. I reverted to v4.1.5 from Debian stable and everything is back in working order, except that qB wants to recheck all torrents again.

I am mostly an uploader. I tried qbittorrent 3 weeks before after hearing it quite often here and on other sides. Dont know if it was the version giganerd mentioned. But with my tests, it was really unrelaiable with uploads. My BiglyBT was way faster in connecting and uploading to the same torrents (and other torrents of course to have clean connections without others knowing me already over peer exchange ect) and clients i tried with qbittorrent. BiglyBT is like BitTyrant, which was modded Azureus after his "bad" successor Vuze appeared.