Question / Help Streaming and recording

Hello there
I can stream liquidly in 1080p 60 fps, VBR 20000.
I can also record liquidly in 1080p 60 fps, VBR 20000

If I do both at the same time my upload to twitch drops from 6k kbit/s to 4k kbit/s. I do also fave only 0.5 fps or lower.
The record looks the same.

Can I do both at the same time with this/better/not much lower Quality?
 
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