AMD Radeon R9 390 Series
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try: chrome://gpu/ in Chrome.
Is WebGL and WebGL2 Hardware accelerated?
Is GL_RENDERER your R390?
Yes
> Is WebGL and WebGL2 Hardware accelerated? Yes > Is GL_RENDERER your R390? Yes
> Is WebGL and WebGL2 Hardware accelerated?
> Is GL_RENDERER your R390?
Then I run out of ideas. The last one is speed throttling of your GPU. Is maybe the temperature of your GPU to high?
35-45C on regular use.