This is one of the examples from the OpenSCAD source on GitHub:
As a guide, you should expect the following speeds for this example:
1.5 seconds in Firefox 23 (unreleased, but available at http://nightly.mozilla.org/)
8 seconds in Chrome 26
20 seconds in Firefox 19
A word about OpenSCAD in the browser
We strongly encourage you to try out the unreleased Firefox 23 (officially due 6th August). This will allow OpenSCAD to run at virtually native speed, due to yet another remarkable project called asm.js.
If you don’t want to trailblaze with Firefox 23, it will work fine with Chrome 26 or Firefox 19, albeit about 5 to 8 times slower.
You can use OpenSCAD without logging in to view generated STLs, but unfortunately you will need to log in to download them, as due to browser security there’s no way to directly save to the operating system. The good news is we’ll keep up to ten of your most recently generated STLs.
Unfortunately, for some reason it runs so slowly in Safari 6 as to be unusable. We’re looking into it.
Currently imports won’t work – although we’re very close to getting that working too.
Please check out our FAQ pages for further information.
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