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I think I was more helpful NOTIt would entirely depend on what is really happening, firstly, if you are encountering any FPS lag, meaning frame rates per second, then that would mean you have too many things downloaded on your computer, or that your computer can't handle that much memory.
If you get any internet lag, then, basically it is your internet that is the problem, meaning that it is pretty slow, and there are various ways to fixing it, maybe getting closer to the router or just turning it off and on again, otherwise, you can always contact your internet service provider.
Otherwise, you will be experiencing Ping lag, meaning that the ping is way too high, for example, the US servers are hosted in California (I think). And maybe you're all the way in Europe or elsewhere around the world, then you would have issues with that, however, to get a little bit better ping, you can always go on the EU, CA, or AU servers, depending on your location.
Hopefully this helped, have a nice day!