Client-side checks

Measure the time that it takes to display the item in the user interface.

It is recommended to also monitor at the same time:

CPU usage of iexplorer.exe (the Internet Explorer process) by displaying the iexplorer.exe file in the Processes tab of the Windows Task Manager screen.
If available, use some type of HTTP traffic monitoring tool to trace when data packets are received on the client side from the server.

If it is found, that data is received quickly, but it takes a long time to display the results in the user interface, then you most likely face some client-side issue. For more information, see: Browser issues.