When loading many images [0] different browsers load the image in a different order and parallelism[1], especially HTTP/3 with Firefox [2]:

[0] https://github.com/TalalMash/100-Image-Load-Test

[1] https://imgur.com/a/b8P3XvB

[2] https://forum.openwrt.org/uploads/default/original/3X/b/c/bc...