I don't know if you should ditch it or not, really. Is there anything more specific that you do; can you recreate it? What was the last big thing you did before it started glitching?
I don't know if it works like this on Macs (never had any reall troubles) but I remember on Windows reinstalling helped. Have you tried this?
If you do decide to ditch it though, I would reccomend Firefox. Its made by the same people IIRC and its pretty simple. I would describe it as fairly lightweight by nature but at the same time highly extensible. Some problems I have with it are that its a port so it doesnt have any of the OSX services, its controls are nonstandard--drop down boxes are like they are on windows, and lastly sometimes Flash can make it lock up... Other than that though, its pretty damn good, IMO.