FYI: No JIT on Windows 8 for ARM - luajit - FreeLists
http://www.freelists.org/post/luajit/FYI-No-JIT-on-Windows-8-for-ARM
The Internet Explorer process on W8ARM has special privileges and is the only one allowed to run a JIT compiler to speed up JavaScript. No other browser will be able to compete on performance with IE on W8ARM. That sure simplifies keeping up with the competition ... ;-)