Okay I don't know if I can be helped here but my computer sometimes has a problem connecting to the internet, and also is very very laggy in any online game. There are 5 different computers (one is a laptop) including mine and also there is a Wii U and an Xbox 360. (usually the xbox is not online though) The Wii U can connect just fine, and it's in the same room as my computer. Hell I've even played that wii sports thing online and I can connect perfectly with people who have good internet with no lag at all. Some of the other computers are slightly slow with the internet, but that does not compare to my computer. Two of the computers, one of them mine, can run max shaders in blockland, with high having barely any lag in singleplayer.
Sometimes I can play on servers with no lag. Other times, it's like a teleporting slow restraining madness marathon or something. Other people say they can see my player jitter around, glitching, teleporting back to where I was a second ago, random stopping etc. The other computers in my household do not experience this problem to this extent. Why is my computer experiencing this the worst?