Set priorities when loading HTML-page

Question

I use a custom javascript on an HTML pageload to decode a 10 second video, using a proprietary codec, not natively supported by the browsers. My problem is that it stalls the browser completely for about 2-3 seconds while the decoding/loading into memory takes place.

Is it possible to actively reduce the amount of allocated CPU-power for specific purposes, so that the browser allocates (for instance) 30% for specific javascript-files? Or perhaps other suggestions in order to prevent the lock-up?

Answer 1

You probably should have a look at Web Workers .

Web Workers provide a simple means for web content to run scripts in background threads. The worker thread can perform tasks without interfering with the user interface.