(2) 4k with mid 2012 MBPro?

can I use the “Plugable Thunderbolt 3 Dual HDMI Display Adapter for Thunderbolt 3 Apple Mac and Select Windows Systems” off my MacBookPro 2012 non-retna with no lag in the screen

Hi Jonathan,

Thanks for posting! Unfortunately no. The Thunderbolt 3 Dual graphics adapters are not backwards compatible with previous generations of Thunderbolt.