Game runs super smoothly, but Twitch stream doesn't?

At the moment I wanted to try out Twitch and I always streamed OBS Studio and an Elgato game on my PS4 which worked perfectly. Now I wanted to play something on the PC myself and stream it, but I saw that the stream was lying, but when I wasn't playing, everything is completely fluid. I'm starting to despair and would like to know why…

I have:
250Mb / s download
40Mb / s upload
Intel i7 8700 3.2 GHz
Nvidia GeForce GTX 1060 3GB GDDR5

if you need anything else please let me know

Yes memory would still be important to know.

8gb ddr4, 4000mhz NB frequency and 1200mhz DRAM Frequency

May be that the 8 gb are too little if you play on the pc and stream at the same time

Do you recommend 16GB or more?

So 16 gb is enough for gaming, even for demanding games, but I would also recommend 32 gb for streaming and 3600 mhz is enough.

Memory is not the problem in this case. I rather see a problem with the correct settings.

Please post screenshots or your settings from OBS.

Of course, 8 GB of RAM is far too little if you don't just minecraft or gamble most games have a minimum of 16 GB RAM

With OBS open and game, the current utilization of the working memory is 94 - 97%

What would be optimal settings? : /

Most games… Eg?

OBS does not encode via memory. RAM is not primary at obs