So for about a week or two (not entirely sure when I first noticed the problem) my Firefox has been acting very strange. With few tabs open it takes up a shitload of CPU on Twitch, frequently spiking to 70-80%, and resting between 20-30% when outside it. Now at first I identified this as being on Source instead of Medium/Low and CPU usage came down considerably. But before and after changing it from Source, the browser would lag noticeably.
When I have a game such as NWN or CK2 running during said Youtube/Twitch sessions, it's very fast and responsive.
During periods of not having Twitch/Youtube open, the CPU usage is between 2% and 20-30%.
CPU is an i5-4690, has never been overclocked (I don't believe it's a model that can be anyway).
Things that have been tried:
Updating Firefox to latest
Using 64 bit over 32 bit
Updating GPU to latest (GTX 970) drivers
Observing CPU use without Youtube or Twitch open
Disabling hardware acceleration in Firefox and Flash
Browser addons and latest update datings:
Epub Reader Feb 17, 2017
NoScript, March 17 2017
Classic Theme Restorer, March 9 2017
Reddit Enhancement Suite, Feb 19, 2017
Addon Compatibility Reporter, March 17, 2017 (Installed this to see if it could help figure out what the problem is)
uBlock Origin March 13 2017
Mega's browser addon, March 16 2017
Addons but disabled:
Avast Online Security
Avast Safe Price
Enhanced Steam (Disabled it when compiling this list, noticing ACR said incompatible with multiprocess) Dec 21, 2015
OpenH264 March 15, 2017
Shockwave Flash 25 March 15 2017
Widevine Content Decrypt, March 15 2017
I have noticed around the same time League started having FPS issues ingame, that browser fuckery was first noticed. This was back around the 11th, others were reporting issues ingame on League too with similar hardware. Makes me wonder if somehow it's connected, but unlikely. Just remarking for posterity.
Disabling hardware acceleration does not seem to have a noticeable effect.
So I ask, minds of FHC: The fuck is wrong with my browser?
Tl,dr; Shitty browser lag on Youtube/Twitch/in general, gets fast and responsive when a game is running, issues started up around the same time League started shitting itself too. Possibly linked, but not 100% sure.