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Legacy GM Networking Lag Spikes



I am attempting to make my first networking game on GM, but I am having large lag spikes very frequently.

In my code the client sends the sever the current_time, server sends back that time, and client compares that to the current_time, giving me my ping.

The game is running at 60fps (both server and client) and moving to 30 fps helps nothing.
I am using a tcp connection and ip adress


the game window is 400*250, x axis is just under 7 seconds of time, and y is the ping, so anything over 250 doesn't show. (the base line is 16/17 ping, perfect for 60fps)

This issue doesn't happen anywhere else on my PC, browsing or playing games

Any ideas what could be causing this to happening?