With this Model: RAX50 - how fast is WIFI with Firewall?

Hello,

I just puchased the Nighthawk AX5400 WIFI 6 router - Model / Version: RAX50.

I wanted to know how fast the WIFI is with this model.  It says over 1GB but with its built in firewall is it slower, or is it 1GB?  

Background:  I wanted to upgrade my Comcast 200 mb connection to 600mb or 1GB

My Questions: I wanted to know if this router will pass through the full comcast internet speed of 600mb or 1GB?  Or will the NightHawk router firewall limit the speed?

Or put another way, when a product says it supports 1GB WIFI, does that include the firewall limititation?   Or how do i check the the firewall spec limit?

Thank you!

Ted