Laggy performance with Black Magic UltraStudioMini and Premiere

Hello! I can't seem to figure out if there's some sort of setting I should be adjusting, or if it's just a failing in Premiere... but when I "transmit" playback to my reference monitor (via Thunderbolt to my BlackMagicUltraStudioMiniMonitor>SDI > FSI DM240 monitor) my playback responsiveness is slow in Premiere. I'm not talking about audio sync/offset. I'm talking about when I hit the space bar to play/pause it takes longer to respond. I don't have this problem when doing the same in Resolve or Avid... and the problem goes away if I un-check "transmit" playback and just use my computer monitor to edit. Does anyone have any insight? Thanks in advance!
SYSTEM SPECS:
•MacBookPro 16" 2019 64GB RAM AMD Radeon Pro 5600M 8 GB/Intel UHD Graphics 630 1536 MB
•Premiere CC 2019 (13.1.5)
•Blackmagic Desktop Video Setup V 11.6