Hi Shehzad,
As the issue is on the client machine you can try increasing the Java heap size on the client.
You can adjust the Java heap size of the machine in the following manner:
1. Click Start > Control Panel > Java (Plug-in).
2. In Java Control Panel, go to the Java tab and click View for the Java Runtime Environment Settings.
3. In the Java runtime parameters field add :
java - Xms1024m - Xmx1024m
I hope this helps you!
- Nrupal