What would cause CrystalDiskMark to show different test results for front USB port compared to rear?

My motherboard is the Asus B450-i and my case front IO USB ports are plugged into the USB 3.1 Gen 1 header on the motherboard using the cable supplied with the case. I'm using Windows 11 as my OS. On the rear I also have 4 additional USB 3.1 Gen 1 ports. I plugged a USB flash drive into the front to test it's speed, and did the same using a rear port. These are the results. I consistently get lower sequential read and write speeds on the front ports. What could be causing this? I was thinking it's the cable for the front USB. If I connect an older USB 3.0 extension cable to the rear port, it c

Question by erotavlas on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.