Re: Apex is running a smooth 60 fps, or if vsync is off 80-100 fps, but still lags??
Your FPS has literally nothing to do with lag, it is a visual problem only, and only if it gets too low.
The 3 squares symbolise packetloss. Do a ping trace if you know how to see how your connection to the Apex data centers are, if the ping trace comes back ok I would consider your connection at home.
How old is your router/modem?
How old is your cable(s) if you use one?
Have you reset your system recently? Turning EVERYTHING off and power back up in the order of Router > Modem > PC
Go to your ISP's website and see if they are experiencing issues in your area.
Last line of defence - Contact them directly and tell them you have an issue, have you had trouble in other online games?
Repair/reinstall the game.