Hi,
To help us investigate the problem, please generate dump files when the application hangs and send them to us. To generate the dumps, follow the steps below:
1. Download the Debugging Tools for Windows package from:
http://msdl.microsoft.com/download/symbols/debuggers/dbg_x86_6.11.1.404.msi
and install it.
2. When TestComplete hangs, open the "Start | Run..." dialog and execute the following command:
"C:\Program Files\Debugging Tools for Windows (x86)\windbg.exe" -pn TestComplete.exe -Q -pd -c ".dump /m C:\TCDump1.dmp;q"
This command will make WinDbg write a memory dump of the TestComplete.exe process to the "C:\TCDump1.dmp" dump file. After the dump is written, WinDbg will be closed.
3. Wait for two minutes.
4. Repeat steps 2-4 twice more (but correct the dump file names in the command lines).
5. Send us all of the generated dump files.
Also, you can try using another SmartBear product, LoadComplete, to perform load testing of your web site. To download a free trial of LoadComplete, please go to http://smartbear.com/products/qa-tools/load-testing/sign-up/.