I’m running Arch on a very early 2000s computer. Dual core athlon with two gigabytes of RAM. With KDE desktop on a period correct display. Works great as long as you are not trying to push it hard with modern tasks. Browses the internet just fine and can even watch videos of a size more appropriate for that era. But yeah, you get into 1080p displays and high resolution videos. Or modern bloated websites. It’s definitely going to chug.