page load time:
This page contains four scripts. Two are inserted using document.write, and the other two are inserted the normal way (HTML SCRIPT SRC). All four scripts are configured to take 4 seconds to download.
Newer browsers load scripts in parallel, so this page takes about 4 seconds to load. But Firefox loads document.write scripts one-at-a-time. This page takes about 12 seconds to load in Firefox.
For more information see my blog post: 5b document.write scripts block in Firefox.