About jogl applet in the web 2

I publish a jogldemo on my web server.
When i access the demo.html from my computer, everything are ok.
But when use other computers test, the jar files can be download correctly, but the render performence very bad.
The canvas update very very slowly.
I make sure the display card 's driver is correct.
Are there some thing I forgot to do?
why ? help
thanks