I apologise for not being clear: certainly multi-core makes a difference to the performance of web apps. My point is that most web apps don't need a drastic ch

I apologise for not being clear: certainly multi-core makes a difference to the performance of web apps. My point is that most web apps don't need a drastic change in the way they are written to take advantage of this: they are already multithread or multiprocess to handle concurrent users. Contrast this to single-user desktop apps which have simpler threading models and are less likely to be "naturally" parallelised to take advantage of multi-core.