Why is my Fortnite stream so laggy, but the game isn’t? (serious)?

Specs:

MSI GTX 960 4gb graphics card
12gb RAM

When I’m recording through OBS or streaming with OBS, my frames remain the same. But the stream is ultra laggy and I don’t know why. I play at a solid 144fps when streaming and when I’m not streaming, but the actual stream itself shows very very low fps footage.
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