The two major applications that i have dealt with performance issues on are an internal calendaring service that i maintained at a large company. And in both of those, the calendar service was anapi with no front end. The front end was maintained by the pliant teams that were not even doing web stuff. We had performance problems that arose because we added too many indexes. Every time you add an index, youre optima sin read at the expense of right. But eventually it does add up. It does. Ya.