DisplayPort 2.1 Cable Fiber Optic 50ft

I ran cabling for this purpose. I'm using a standard Cat5 ethernet cable with this USB extender for keyboard/mouse. I installed this 50' optical DP cable for video / audio. I connect a 3.5mm audio cable from the back of my Innocn 34Q1R OLED monitor to my speakers. The computer lives in the closet to my spare bedroom. I ran both cables up the wall (it's an interior wall, so there was no insulation) into the attic, across the house, and down another interior wall to where my monitor / keyboard / mouse live. A friend of mine that claims to be able to tell the difference when display settings change / difference between different refresh rates insisted the PC was actually in my computer desk, installed where the desk drawers are. The monitor is at 3440x1440@175Hz using the afore linked cable and an nVidia 4060ti. I've been running a similar setup for 9 years now -- same USB extender, though prior to using the optical DP cable, I had a 50' RapidRun HDMI cable. I've been using the optical DP cable for 2 years now. Other than the connector at the PC side being warm, I've had no issues with it. I don't play FPS-type games, but I have been playing Diablo 4, The Last Caretaker, StarRupture, etc without issue. IF the USB extender is adding any input lag, I can't tell, nor can my friend who is allegedly super-sensitive to such things... lol