Aside from a slow internet connection, there are other things that could be causing high ping, such as your PC settings, the server youre choosing to play CS:GO on, or bandwidth hogging applications. An old network adapter, less storage, and memory along with a GPU can all lead to high ping and lag issues.

How can I reduce lag?

How to Reduce Lag and Increase Internet Speed for GamingCheck Your Internet Speed and Bandwidth. Aim for Low Latency. Move Closer to Your Router. Close Any Background Websites and Programs. Connect Your Device to Your Router via an Ethernet Cable. Play on a Local Server. Restart Your Router. Replace Your Router.More items