Windows 10 Pro: Firefox 40.0 constantly using 75 to 85% of cpu with HTML 5 1080 p video playback

Firefox version 40.0 can no longer play videos from youtube.com without ridiculously high levels of cpu on my 10 Pro 64-bit Windows System. The non-video HD, the cpu is using Firefox level is a constant 45 to 50%. On change to 1080 p HD, Firefox 40.0 now consumes a staggering 75-85% of cpu. It started since the upgrade to Firefox 39.

Opera of 31.0, Edge and Internet Explorer 11.0.10240.16384 all use less than 20% cpu when running HTML5 or Flash in mode HD 1080 p on the youtube.com site.

Why Firefox works at 75-85% of the cpu on my system? Video on youtube.com is rough and stutter and 40.0 Firefox is having a devastating effect on the proper functioning of my entire system, mounted in power overall cpu usage just up to 100%. He managed to slow down my entire operating system. I've never had this problem with Firefox before, not even in many Insider Preview of WIndows 10 Pro versions.

No one knows what causes this unacceptable amout of use cpu 40,0 Firefox and how to fix it? I already uninstalled Firefox completely and re-installed. This had no effect on the cpu extreme use.

You use NVIDIA? It of because they were disabled, so more processing power to use hardware acceleration.

[[Hardware acceleration in Windows 10 does not work - NVIDIA |]] https://support.mozilla.org/en-US/questions/1077259]]

Tags: Firefox

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