Minecraft Extreme Lag Issues?

I have been playing minecraft for the past few weeks but since yesterday i have been having extreme lag issues where i disconnect from the server as soon as I join. I know it's not my internet because I have tried it on my dads work laptop and it has worked fine but as I said he uses it for work so i can't use it

Server? So are you playing on a server? If so its probably the server, you might want to tell the person who owns it.

Yes, server but its not the server because everyone else can play on it fine and my dads computer is fine on it