It said on cydia that it wasn't compatible yet with 7.1.2, so this could be why it's making my phone lag? I only downloaded it to get couria to quick compose. I also had to restart my springboard earlier too because it crashed. :/
I had been having problems with my iPhone lagging too. I am still narrowing it down between activator and tiny bar. I uninstalled both, and it's working fine now. Could have been either of the two interacting with another app as well, hard to know.