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 do I fix high ping in CS:GO?

How to fix CS:GO high ping issuesFix 1: Restart your modem and router.Fix 2: Verify integrity of game cache files.Fix 3: Close bandwidth hogging applications.Fix 5: Renew IP address.Fix 6: Change DNS server.Fix 7: Modify registry settings.Fix 8: Reinstall the game.Fix 9: Swap Wi-Fi to an Ethernet connection.Jan 21, 2021

Does high ping matter in CS:GO?

Yes, it definitely will. You are most likely not noticing the lag because of interpolation. A high latency will negatively effect any online game, most notably FPSses - in the case of Counter Strike latency is extremely important.