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 :-).
Web Apps, SPA, PWA with vanilla Java Script (ES 6+), CSS 3 and WebStandards only. As simple as possible, but not simpler. See you at: (Progressive) Web apps, Single Page Apps and WebStandards airhacks workshops at MUC airport, Winter Edition
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