You have a good computer but still having issues.
Your internet is "fast" but you're still having issues.
Well, do you have minimum neighborhood congestion, no wind, a good wifi card, a great rig, live in a coastal city, and are situated right next to the router with no one else in the house using it? No? Oh okay then, please go and get a damn ethernet cord. It is by far the number one way to solve your stream issues. I will talk about other things when we get through this big one, because it's extremely important.
The internet speed you are advertised as getting is not the internet speed you're getting if you are using wifi, on average you're getting about 1/4-1/10th of the speed of your advertised internet speed.
For example: Below is my internet speed on wifi, using fast.com (a website used for testing your internet speed created by Netflix, explicitly geared to seeing if your internet is fast enough to stream stuff properly).
Note: I am literally a foot away from my router, which is under my desk.
Not too bad right? I mean, for someone in rural Ohio this is probably like, 10x faster than they get on average.
For comparison, this is my internet speed with an ethernet cord:
Much better, isn't it?
That's 8 times faster.
I have a 70 ft ethernet cord that stretches from my room where the router is through my kitchen, living room, to the other side of the house. It was, 10 dollars. There are 200ft and probably longer ethernet cords that don't top more than 20 dollars. It's worth the money trust me. You will notice the difference immediately.