The browser that gives the best performance is Opera GX. Install it, and then type chrome://flags in the address bar.
Search for and enable the following options:

In order to optimize FPS, it is recommended to turn everything to off / lowest except for:
If you’re having extremely worse performance than expected, try the following items:
[ ] On laptops, plug in the charger and configure Power Management options for high performance
[ ] Install the latest drivers for your GPU
[ ] Type chrome://gpu in the address bar and ensure that:


(If neither are the case, follow the instructions on the bottom of the page)
[ ] Type chrome://flags in the address bar, search for Choose ANGLE graphics backend, and set it to OpenGL
[ ] For NVIDIA users, go to the NVIDIA Control Panel (Right click Desktop > NVIDIA Control Panel). Then, click on Managed 3D Settings, then Program Settings, and pick your Browser (Chrome or Opera GX) from the dropdown.
