Tried it repetier-firmware, surprise, the efficiency is very high, not entirely perfect optimization can also support 12864, looked at the code and found repetier completely rewritten u8g support libraries for 12864, efficiency Leverage drops, it is recommended that you use repetier speed much faster than the marlin

Wow,
can you post some real example, video or comparisons?
Here almost everyone uses Marlikimbra, try this, instead

[marlinkimbra.it]

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Enrico

[www.dapa3dservice.it] [www.studiodapa.it]
repstrap dApA, Ramps 1.4, MarlinKimbra / scanner 3D Cubify Sense / Formlabs Form 2