On a slow internet connection this may take a moment. If this
message displays for "a long time", intialization may have
failed and the JavaScript console may contain clues as to why.
Downloading...
Tips:
Control-click the flags to (de)select multiple flags.
The easiest way to try different optimization levels is,
from this directory:
$ rm -f speedtest1.js; make -e emcc_opt='-O2' speedtest1.js
Then reload this page. -O2 seems to consistently produce the fastest results.
TODO: add a link in this app which launches the main-thread
version with the same flags.