Hi,
Once you open you ESR and ID, then next time go to
Control Panel-> Programs->java..... in that under General tab->Temporary Internet Files-> Click VIEW
If you can see entry for ESR and ID the it is cached and even then it is taking time means the BANDWIDTH to your system and server system is too less..
the main file "client.jar" is around 10mb in single stack and it takes sometimes 8 to 10 minutes o average for me to open them.
Regards,
Vikas