This doesn't absolutely answer your question (as it doesn't look at the size of the actual firmware), but I did a quick run to see how the amount of code change

This doesn't absolutely answer your question (as it doesn't look at the size of the actual firmware), but I did a quick run to see how the amount of code changes in OpenWRT between releases, this is the results: https://pastebin.com/04s1TL49 https://pastebin.com/04s1TL49 Here is the latest ones: files blank comment code refs/tags/v21.02.4|Sun Oct 9 19:13:29 2022 +0200 SUM: 6152 105231 202581 1095273 refs/tags/v22.03.1|Sun Oct 9 19:32:19 2022 +0200 SUM: 4942 92892 159322 758218 refs/tags/v22.03.2|Sat Oct 15 14:45:57 2022 +0200 SUM: 4989 94174 160996 761805 refs/tags/v21.02.5|Sat Oct 15 15:02:44 2022 +0200 SUM: 6154 105246 202621 1095314 refs/tags/v22.03.3|Tue Jan 3 22:03:37 2023 +0100 SUM: 5030 94497 161559 768700 refs/tags/v22.03.4|Sun Apr 9 23:35:19 2023 +0100 SUM: 5054 94718 162335 769994 refs/tags/v21.02.6|Sun Apr 9 23:38:36 2023 +0100 SUM: 6283 106307 206300 1107999 Command used: $ git for-each-ref --sort=creatordate --format '%(refname)|%(creatordate)' refs/tags | while read line ; do echo $line; cloc --git $(echo $line | cut -d '|' -f 1) --processes 32 --quiet | grep SUM ; done