Does it give the jittery issue like procon if you leave it on?

nope, what jittery issues with procon are you talking about?

There use to be a issue with procon where it caused lag spikes occasionally in game and I haven't been the only person to have them. I don't know if it's still a problem since i don't leave the program open while I'm playing. Apparently it's a issue with windows and the code but i hnfi.