The first start/installation of JFtp (see screenshot) via WebStart takes about 10-20 seconds. All subsequent starts about 5 seconds - (on Java 6u10). Another great sample for WebStart, Swing and Java 6u10 combo.
Btw. it is a Ftp, Http, Ssh, SMB etc. client :-).
NEW: Online Workhop Effective WebApps without Frameworks is also coming to: MUC Airport.