The performance lag of the SSD and CPU will be minimal, as the CPU will in all likelihood have Intel SpeedStep (or TurboBoost*), which will enable the CPU to effectively overclock itself to a higher rating (For example, my NetBooks Core i5 runs natively at 1.5GHz but will boost to 2.3GHz if need be.)
As long as the CPU is at least a dual core (hopefully with Intel HyperThreading) and the CPU can keep up with the amount of data you need to process, you will have no noticeable impact on performance, even when running three code editors, Flash CS5, a couple of browsers and XAMPP.
That said, you will have to pick a CPU that can keep up with the requirements of the apps you want to run.
Verdict: No Noticeable Lag
*I can't remember what Intel calls their CPU boosting tech