Update.
The USB flash drive I chose (Kingston Data Traveler Exodia, 256GB) was horrendously slow. How slow ? I did the install on an old machine. It took forever. Like an hour. I thought it was the machine, even though it has a USB 3.1 port. This morning I moved to a faster machine and attempted to do a dnf update on the install. Again, horrendously slow. It came to a complete stop. I CTRL C'd the update and headed back to my local computer hardware store.
I chose that particular flash drive because it features USB 3.2 Gen 1 capability and a 5 year warranty !
I replaced the Kingston flash drive with a Western Digital Blue SN550 M.2 NVMe SS, 500GB. Because it was the right size, on sale and I thought that a faster SSD would just further overwhelm the USB interface. Also this SSD apparently draws less current then some other faster ones and apparently current draw can be an issue with USB to M.2 SSD adapters.
I mounted the NVMe SSD in a Vantec M.2 NVMe SSD to USB 3.1 Gen 2 type C external enclosure. (NST-205C3-SG) I chose this enclosure because it has heat fins to dissipate the head generated by the SSD. In fact, this enclosure has a heat sink that gets installed on the SSD that contacts the case. From my reading, heat buildup can be a problem for NVMe SSDs running in an enclosure like this.
Result: fantastic operating speed ! It is obviously not as fast as operating on the native OS, but operating from the USB SSD is darn snappy. I'm used to doing maintenance work with a slow Live USB drive. THis USB SSD is a fast Cadillac compared to them. I am now very happy with my "maintenance" drive. I should have done this years ago.
The drive gets warm to the touch during regular use, but nothing alarming so far.
Aside
An interesting thing happened when I installed F35 on the USB SSD drive using the Live USB drive : it chose a plain old file system instead of LVM.
$ df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 32G 0 32G 0% /dev
tmpfs 32G 0 32G 0% /dev/shm
tmpfs 13G 1.9M 13G 1% /run
/dev/sda3 465G 4.7G 459G 1% /
tmpfs 32G 24K 32G 1% /tmp
/dev/sda3 465G 4.7G 459G 1% /home
/dev/sda2 974M 198M 709M 22% /boot
/dev/sda1 599M 14M 585M 3% /boot/efi
tmpfs 6.3G 144K 6.3G 1% /run/user/1000
Filesystem Size Used Avail Use% Mounted on
devtmpfs 32G 0 32G 0% /dev
tmpfs 32G 0 32G 0% /dev/shm
tmpfs 13G 1.9M 13G 1% /run
/dev/sda3 465G 4.7G 459G 1% /
tmpfs 32G 24K 32G 1% /tmp
/dev/sda3 465G 4.7G 459G 1% /home
/dev/sda2 974M 198M 709M 22% /boot
/dev/sda1 599M 14M 585M 3% /boot/efi
tmpfs 6.3G 144K 6.3G 1% /run/user/1000
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