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Citace:# SD Card - SanDisk Extreme SDHC UHS-I 32GB class 10 (SDSDX-032G-X46 maybe or s.t. similar)
On Windows with Delink Card Reader I am able to read/write 100/50MB/s, here it changes (and reading is slower - in any test).

(write) LibreELEC:~ # sync; dd if=/dev/zero of=./test.tmp bs=500K count=1024
1024+0 records in
1024+0 records out
524288000 bytes (500.0MB) copied, 15.941096 seconds, 31.4MB/s

(clear) LibreELEC:~ # sync; echo 3 | tee /proc/sys/vm/drop_caches

(read) LibreELEC:~ # sync; time dd if=./test.tmp of=/dev/null bs=500K count=1024
1024+0 records in
1024+0 records out
524288000 bytes (500.0MB) copied, 22.870083 seconds, 21.9MB/s
real 0m 22.87s
user 0m 0.02s
sys 0m 1.32s

# Internal Memory of Beelink GT1-T-D1 3G/32GB/6335/-A (mount -o rw /dev/data /tmp/data)

(write) LibreELEC:~ # sync; dd if=/dev/zero of=/tmp/data/test.tmp bs=500K count=1024
1024+0 records in
1024+0 records out
524288000 bytes (500.0MB) copied, 2.510985 seconds, 199.1MB/s

(clear) LibreELEC:~ # sync; echo 3 | tee /proc/sys/vm/drop_caches

(read) LibreELEC:~ # sync; time dd if=/tmp/data/test.tmp of=/dev/null bs=500K count=1024
1024+0 records in
1024+0 records out
524288000 bytes (500.0MB) copied, 3.693659 seconds, 135.4MB/s
real 0m 3.69s
user 0m 0.01s
sys 0m 1.18s

# USB3.0 HDD Samsung HM750LI (mount -o rw /dev/sda1 /tmp/data)
// Tested on both ports ... ~0,5MB/s difference in 1 Test so .. confirmed and negligible - interesting - 1 port is supposed to be usb 2.0 ... not with that speeds. 

(write) LibreELEC:~ # sync; dd if=/dev/zero of=/tmp/data/test.tmp bs=500K count=1024
1024+0 records in
1024+0 records out
524288000 bytes (500.0MB) copied, 9.072689 seconds, 55.1MB/s

(clear) LibreELEC:~ # sync; echo 3 | tee /proc/sys/vm/drop_caches

(read) LibreELEC:~ # sync; time dd if=/tmp/data/test.tmp of=/dev/null bs=500K count=1024
1024+0 records in
1024+0 records out
524288000 bytes (500.0MB) copied, 14.759751 seconds, 33.9MB/s
real 0m 14.76s
user 0m 0.00s
sys 0m 1.07s

(If you do that, don't forget to delete files and unmount)

Short note - over Gbit LAN using Samba (vs. Win10 Client with Intel NIC connected to the HDD) : It's ~ 20MB/s - R/W