Guild Wars 2

I’ve suddenly been getting really messed up screen glitch issues out of nowhere. Repairing through terminal does nothing. Playing on an Mac Book Pro late 2013. Gets so bad that I can’t play since i can’t see anything. Screenshot below.

Anyone know what this might be and how to fix it?
Ty in advance.

I have learned that on my laptop, if I am running on battery mode, the computer changes it’s settings and uses the integrated graphics card to save battery life. Are you using battery or plugged in when you get the glitches?