OK some technical information explaining possibly why OM Lx 3 performs so slow for me on a flash drive. I used USB 2.0 flash drives that have read speeds like this:
# hdparm -t /dev/sdc /dev/sdd
Timing buffered disk reads: 44 MB in 3.09 seconds = 14.24 MB/sec
Timing buffered disk reads: 68 MB in 3.06 seconds = 22.22 MB/sec
That is slow as molasses. By comparison:
# hdparm -t /dev/sda /dev/sdb
Timing buffered disk reads: 378 MB in 3.01 seconds = 125.72 MB/sec
Timing buffered disk reads: 1594 MB in 3.00 seconds = 531.09 MB/sec
Where /dev/sda is a Western Digital Caviar Black conventional HD I use for Data storage only. /dev/sdb is a Curcial SSD where my operating systems are. So the difference in read speed is huge.
I do have a couple of Memorex USB 3.0 flash drives with:
# hdparm -t /dev/sdd
Timing buffered disk reads: 250 MB in 3.01 seconds = 83.16 MB/sec
Which would be anywhere from approx. 4 to 6 times faster. I have ordered some super duper Samsung BAR Plus USB 3.1 flash drives that claim 200 MB/sec read speed which should be great for this. Now all I need is the time to do it.
This does not change the fact that @Gassho and @jimmyc report faster results with other Linux distros on flash drives. It does mean that one must pay attention to the read speed of the media they are installing to as the biggest hardware factors of how fast this will work is the read and write speed of your flash drive and the USB controller on the host computer. I suspect the read/write speed of the flash drive is the biggest factor. Other than perhaps the software which is the operating system.
But I’m still learning.