Originally when I started the move to Linux in 2015, I did it because Windows 10 was wholly incompatible with my ISP. I lived through dial-up, HEO satellite, HSPA, LTE, fixed wireless, and currently fiber. During the period with dealing with HEO satellite, every provider at the time in the US (WildBlue/Exede/Viasat, Hughesnet) had alright speeds at best paired with a very aggressive soft monthly data cap (10 GB, eventually 26GB in like 2018), that would revert the speed capabilities back to 32-96kbps. Upgrading from Windows 7 to Windows 10 was largely a mistake for many reasons, but one of them was the sheer frequency, size, and aggressive nature of how Windows 10 tried to download and apply updates automatically. Windows 10’s frequent auto updates would easily eat several gigabytes each month of the tiny data cap. The rest of the amount of idle networking Windows 10 did also didn’t help during throttled periods, eating up most of the bandwidth available from just one workstation. Knowing that Windows 10 wouldn’t be another Windows 8 and that Microsoft would go forward with 10, I decided to seriously look into alternatives.
Eleven years later, I have virtually no restrictions in hardware nor networking. Despite that, I still use Linux exclusively. Nowadays, there is little to no compromise in using a Linux-based system for many general tasks. Certain niches vary in usability on Linux, especially if the niche is cemented in certain proprietary software. Modern Linux-based systems (both distro and desktop environment) are just more polished than the experience to be had on Windows 10 or Windows 11. Many common frustrations when using Windows (device driver installation, printers, drawing tablets, HDR, system updates, software updates, system maintenance, lack of dark patterns, error message clarity, etc.) are things that a modern Linux system deals with a lot less, to a lesser extent, or just not at all. After spending many years learning both Windows and Linux, Linux systems are just more functional and easier to use.
Based on OP’s edit, that looks correct. Unless OP checks the topology and can make the claim that drives from the main chipset are the slow ones, secondary chipset drives will tend to perform slower, and the ASMedia ASM1061 has several reports online of poor to trash performance compared to baseline.
Best bet if the full performance is necessary out of every drive would be finding a decent quality PCI-E SATA III riser card that doesn’t use a known flawed driver chip rather use the two ‘extra’ ports on the motherboard.