There's likely something with the system configuration, from what drivers you're using to where the monitor is actually plugged in.
The game is faster, but not as much as if it was turned off.. but there is no hitbox, in fact, for some reason, if G-sync is turned on, if I open a new window in the Brave browser, the image goes dark and comes back, as well as the alt +tab in the games 1024x768 in csgo, cs1.6 takes less than 5 seconds and there is a black screen underneath, my old 165 G-sync monitor did not have this.
Processor: AMD Ryzen 5 5600g 6 Core 12 Threads
Motherboard: ASUS PEMIUM B550-PLUS
RAMS: 2x8gb(KIT) Kingston FURY Beast 16GB DDR4 3200MHz KF432C16BBK2/16
Videocard: GIGABYTE GeForce GTX 1660 SUPER 6GB
SSD: (IN WINDOWS AND 2 GAME): Samsung SSD 850 EVO 250GB
HDD1: TOSHIBA DT01ACA100
HDD2: TOSHIBA DT01ACA050
Monitor: Acer Predator XB253QGXbmiiprzx UM.KX3EE.X07 240hz G-sync is on
Drivers: