Notebook is an Intel ICore i7 with Ubuntu xfce 23.10 installed and running MultiWriter to create a bootable Fedora xfce 39 usb stick.
I tried with Startup Disk Creator, but I couldn’t change the .iso file on the menu, so I turned to Multiwriter.
I also created a bootable Linux Mint 2 weeks ago with a macOS 12 and OCLP (open core legacy patcher) and IIRC that was much faster than with Linux. Is macOS faster creating bootable sticks?
Sorry its not an answer to your question, but if you distrohop, take a look at Ventoy. One time write to make it a bootable system, then you just copy ISOs to the drive and you can boot them
I think that’s just hardware limitation. My USB2.0 sticks get 10MB/s and USB 3.0 get around 20MB/s
For faster stuff get a SSD with USB adapter
What’s the write speed of your USB stick?