Try this.
Log off game
Flush your DNS https://www.technipages.com/flush-and-reset-the-dns-resolver-cache-using-ipconfig
Unplug your modem for a full minute (to delete all the data it has stored from all the websites you have visited)
Plug modem back in.
Restart your comp
Let me know here if that works for you. because It worked for me I had lag also but did all that and have had zero lag now for 2 months.
Worth a try.
It happend to me on pc, but practically lagless in ps4