When I pacman-Syu, it fluctuates between 200kb to 500kb
I checked my internet speed at fast.com and it says 490Mbps
Something isn’t right.
Reflector is doing its job. I checked /etc/pacman.d/mirrorlist and saw the last updated time is very recent (today).
Yes, but reflector can’t do magic. Just manually go through the mirrors and try if they’re fast enough. You should prefer geographically closer mirrors.