Before reporting that the "system is slow", please make sure to add the following to the bug report:

1.Which is exactly the slow operation? The best is to provide step-by-step.

2.Define "slow": provide the timing? The best is to have also the timing of the same operation (done on same data) done with earlier builds.

3.Which is the db server status when the operation is slow (cpu, memory)?

4.Which is the IIS server status when the operation is slow (cpu, memory)?

5.Did you try the same operation after production with less load? Has the same timing?

6.Can you provide a Fiddler of the operation?