modded minecraft framerate tanks when streaming

[wishingpenguin8]

ive been dabbling in live-streaming on twitch since i've built my pc. it should be capable of it and it is I've streamed the long dark(built in unity cpu intensive), fallout 4 among other thing and i never saw a  noticeable difference in performance but when i try to stream modded mine craft the frame rate goes down to single digit even thought obs is only using 15 of my cpu i even tried changing it to gpu hardware encoding and it made a marginal difference im at a loss 

[voyager_]

what percentage of the CPU is minecraft using. Minecraft is very CPU intensive while games like fallout are typically limited by the GPU.

[wishingpenguin8]

while playing it uses about 10/15% and when loading other dimension it can go up to 70%

[wishingpenguin8]

i have a 1700x