This setting is surprisingly fast for my potato.
Display Quality - High
Fullscreen Quality - Software (Speed) <-- this one is needed for potatoes
Weather - Enabled
Global Effects - Enabled
Hit Effects - Enabled
Knockback Smoke - Enabled
Hud Fade - Enabled
Screen Flash - Disabled
Ambient Lightning - Disabled
Shadows - Enabled/Disabled
Stage Effects - Simple/Enabled
Menu BG - Enabled
I also use Windows 10, but I don't know if it also works for you.
_________________black keys will be removed in the future anyways
*sniff*