So both maps are among the first additions to quake live. There are nothing wrong with them game-wise, however performance-wise they are a bit clunky. From my personal experience, original maps runs very well as well as other later added maps (125 fps). Playing Ca1 or Ca3 fps number starts jumping from 60 fps to 125, which makes playing these maps unbearable . I know there are other people who faces same problems.
Maybe my hardware is not the best, but I believe that fixing these maps would make game more fluid for everyone.