Slow dialog box on VPS

I am having issue with my VPS.
When I attach EA to a chart, I click on Load to load a set file, the dialog box for me to select the .set file takes a long time to appear.
Otherwise the VPS is quite responsive. Is there any settings I need to do to resolve this?

Thanks for your help.

is your vps in lack of RAM or CPU?
is your network speed low?
What OS on server?

Contact tech support for the VPS provider. They should know what to do.