Changes
MAME
,/* BGFX */
Check with F11 if you still get 100% performance. If not, adjust frame skip with F8/F9.
Also, if you press the tilde (~) and then cursor up/down, you can adjust the shader settings(they are also under Slider Controls in the MAME menu). These are not saved at the moment though.[http://docs.mamedev.org/advanced/bgfx.html]
If you edit bgfx/chains/hlsl.json in a text editor, you can change the default values. E.g., to reduce the Moiré pattern, search for "Shadow Mask Amount" and change it to: