Measuring wait times
We can use a number of ways to find out which external requests are most frequent and how long the site has to wait for a response:
Run the code in the debugger with breakpoints around each external request. This will give you a quick hint of which external request is the likely culprit. However, you wouldn't do this in a production environment, as it only gives you information for a few requests.
Use the Trace class (in the namespace
System.Diagnostics)to trace how long each request takes. This will give you a lot of detailed information. However, the overhead incurred by processing all the trace messages may be too high to use in a production environment, and you would have to somehow aggregate the trace data to find which requests are the most frequent and take the longest.Build performance counters into your code that record the frequency of each request and the average wait time. These counters are light-weight, and hence, can be used in a production environment...
