http://demo.servoy.com:8080/index.html
If you haven't tried the online demo I'd encourage it. After the initial 2.2MB download and loading - things start to move.
I'm using a really bad dialup connection - a 28.8 six year old Supra modem on an XP notebook. I am really suprised and impressed with the speed over this weak connection. In some cases I believe displaying, entering, and editing data over this WAN is as fast as using my former database tool (version 6.04) over a LAN. Granted, with this Servoy online demo I'm not hitting a huge database but this is really impressive. It's undoubtedly faster than a web browser.
Congratulations to the Servoy team - you've removed the speed concerns.