AMD Radeon R9 390 Series
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?
Develop games in your browser. Powerful, performant & highly capable.
35-45C on regular use.