Updating LibreElec version on RPi4/5

This question may be better asked on the Raspberry Pi forum but I'll try here first.

I generally update my RPi4/2gb & RPi5/4gb every time a new le12 nightly comes out and a while ago observed there was a noticeable difference in the time taken for them to update.

Finally got round to using a stopwatch to check (these are times from when the "Decompressing image file..." message first appears):

RPi4: time to decompress = 27 secs; total time up to the "System reboots now..." message = 40 secs
RPi5: time to decompress = 54 secs; total time up to the "System reboots now..." message = 78 secs

So double the time for a much more powerful cpu - unless I'm missing something glaringly obvious. Double the ram shouldn’t make any difference should it?

I'm not really bothered about waiting for it to update, more curious as to why a RPI5 is so much slower.

p.s. le running on a usb 3.0 stick in both cases (similar read/write times).

Quote from chewitt

The most likely explanation is a difference in the performance of the SD cards. I'm using an NVME drive on the RPi5 and it's 25-30 seconds from typing "reboot" to looking at an updated Kodi home screen.

I had assumed the usb sticks I am using to boot le were a similar speed going by the "headline" read/write speeds but now that I've done an actual speed test with "hdparm -t /dev/sda" it appears the usb stick in the RPi4 (Samsung Fit 32gb) is getting towards 2x faster than the one in the RPi5 (Sandisk Ultra Fit 64gb) - 195MB/sec vs. 115MB/sec. As a comparison, the 4tb NVME drive in the RPi5, which is used purely for storage, is 550MB/sec

But would still have assumed the RPi5 should be much faster at decompressing the update file.

Sorry for the time-wasting.