I'm experiencing serious FPS problems with some of the new weapon models when "Realtime world lighting" is turned on. This only happens on certain maps, with Stormkeep and Evilspace being the worst. The affected weapons are:
I can be standing still getting a solid 60FPS, but it drops to an incredibly uneven 30FPS as soon I equip one of these weapons. Disabling "Realtime world lighting" brings the frame rate back up to 60, but I still get occasional frame rate hitches that are noticeable when walking. So far I've reproduced this on 3 relatively new Macs running macOS Sierra which had no issues with "Realtime world lighting" before the update.
I've attached a version of Evilspace guaranteed to reproduce this issue: evilspace.pk3