USB 3.0 boot horribly slow

Troubleshooting
1

I’m running DietPi on a USB 3.0 memory stick. Benchmark was 1MiB/s write and 91 MiB/s read. SD card boot and usage is much faster.
Pi 4B is the setup.

Any way to make this muuuuuuccccch faster?

2

Oof…that is low…it should be alot faster than that…daggum

This shows there might be an issue with the RPi 4 boot from USB

The Pi 4’s USB 3.0 bus presents a high-speed alternative to the SD card… almost. Unfortunately, you can’t yet boot the Pi 4 off a USB 3.0-connected drive (as you could with the Pi 3) but you can at least use USB for your primary storage and retain the Pi’s micro SD card solely for boot duties. This minimizes the risk to this fragile medium.

however it doesn’t explain those horrible write speeds…

3

how does it behave using USB2 port?

4

Slow from both

5

how does the stick behave on another computer?

6

I’ll put it in my Linux laptop and do a benchmark then get back with you.

7

WRITE to USB:
$ sudo dd if=/dev/zero of=/media/themagicm/rootfs/largefile bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 23.1098 s, 46.5 MB/s


READ from USB:
sudo dd if=/media/themagicm/rootfs/largefile of=/dev/null bs=4k
262144+0 records in
262144+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.237135 s, 4.5 GB/s

8

did you tried a different USB stick/disk on the board having the slow speed?