To perform heavy duty tests you need to tune your OS.
Windows Tuning
Open an Explorer Window and navigate to the ZebraTester installation directory(typically at c:\users\<your-name>\zebratester).
Run the script **WindowsTuning.bat** as **Administrator*
Reboot the machine for changes to take effect.
1.3.2.1 Disabling HTTP/S Anti-Virus Network-Scanning
Almost all anti-virus products support to scan the HTTP/S network traffic but they are often not able to handle the load released by a load test – and they delay also the measured response times. Therefore we recommend that you disable scanning of HTTP/S network connections for viruses. Please note that you should not disable completely your virus scanner. Especially scanning the Disk I/O for viruses should be still enabled.
The following picture shows as an example of how to disable HTTP/S anti-virus scanning in Kaspersky:
We recommend that you re-enable HTTP/S anti-virus scanning after the execution of your tests has been completed.