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.

Is 5ms good ping?

Ping amounts of 100 ms and below are average for most broadband connections. In gaming, any amounts below a ping of 20 ms are considered exceptional and “low ping,” amounts between 50 ms and 100 ms range from very good to average, while a ping of 150 ms or more is less desirable and deemed “high ping.”