Yup, seems like you found the bottleneck.
I'm kinda surprised that you hit that limit on Classic so easily. What resolution, how many monitors, FPS and graphics settings are you running your minions at? I can't speak to the IS Boxer side of this, but when I run 5 classic clients across 3 monitors I only cap out my video card when I run multiple clients at 4k 60Hz with all settings at 10. When I turn a few settings (shadows and SSAO are the 2 biggest GFX users and the settings I care the least about) down a bit I'm OK again.
I'm running a 1080Ti vs your 1080, but it seems like that'd be easy to cut back graphics settings on your minions a bit and keep everything stable.
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