So I installed this rom at the beginning of September and have used it till now.
This ROM has made my phone run like complete crap. Are there any suggestions to fix this?
I have all but weather turned off on Google Now. Nothing else is running that I wouldn't have had running on ICS.
Part of the problem may be Google Now at all. It's a huge battery drain and it's really not worth it, IMHO.
Also, you should look into the default clock speed/voltage/governor/etc of your original ROM. It's possible that your device just works better with certain settings, or that you're used to performance over battery life or something.
In short, there are a million variables, and the ROM is just one of them. But saying that the ROM made your phone, "run like complete crap" is both unhelpful and rude. It gives no explanation as to what the issue could be, if it's video, interface, call quality... there's no information available.
Furthermore, you're comparing to ICS, a system that's been developed for a year, to JB where the current birthday is still this year (June of 2012, if you're curious). That's less than 6 months to do what another full version has gotten to in a year and a half. Of course there are bugs. If you're getting one, report it. Poor performance? Give scenarios to reproduce. But for the sake of all that's holy, don't just say, "this rom runs like crap. i'm taking my ball and going home." Just leave quietly, and someone won't have to post a treatise on why that's the wrong thing to do.