Could a not updated BIOS be responsable for this excessive RAM usage?
I guess that this is the problem. I’ll try it and let you know
It’s not excessive. It’s totally normal.
I don’t understand what you are concerned about. 
Well, while we are at guessing instead of knowing:
my guess is: it is not - because there is no problem to begin with.
Only a perceived one.
But if there is a Bios update - update it.
Hope you don’t brick the machine in the process - because this is a potentially risky procedure which I’d not do without good reason, while everything works.
best wishes!
Ridicules… but hey… here something to compare:
$ smem -k -t
PID User Command Swap USS PSS RSS
921 max inotifywait -q -e create /h 140.0K 4.0K 14.0K 1.4M
8838 max wob -c /home/max/.config/wo 256.0K 4.0K 16.0K 1.5M
8840 max wob -c /home/max/.config/wo 260.0K 4.0K 16.0K 1.5M
8837 max tail -f /home/max/.cache/sw 112.0K 4.0K 17.0K 1.5M
922 max xargs notify-send Screensho 112.0K 4.0K 18.0K 1.6M
8839 max tail -f /home/max/.cache/sw 112.0K 4.0K 18.0K 1.6M
1335 max /usr/bin/zsh 3.0M 0 21.0K 1.2M
1785 max /usr/bin/zsh 3.0M 0 22.0K 1.3M
1797 max /usr/bin/zsh 3.9M 0 33.0K 1.2M
1347 max /usr/bin/zsh 3.9M 0 36.0K 1.2M
1306 max /usr/bin/zsh 4.7M 0 49.0K 2.6M
1758 max /usr/bin/zsh 4.6M 0 52.0K 2.7M
43172 max /usr/bin/zsh 3.0M 4.0K 78.0K 1.6M
1350 max /usr/share/zsh-theme-powerl 224.0K 40.0K 86.0K 3.2M
1800 max /usr/share/zsh-theme-powerl 224.0K 40.0K 86.0K 3.2M
43185 max /usr/bin/zsh 3.8M 0 92.0K 1.6M
966 max sh -c [ -x "$(command -v pl 640.0K 28.0K 93.0K 1.1M
894 max wl-paste --watch pkill -RTM 60.0K 100.0K 117.0K 1.6M
1348 max /usr/bin/zsh 3.8M 84.0K 117.0K 1.0M
892 max wl-paste --watch cliphist s 56.0K 100.0K 118.0K 1.5M
1798 max /usr/bin/zsh 3.8M 88.0K 119.0K 1.0M
865 max /bin/sh /usr/share/sway/scr 440.0K 4.0K 128.0K 2.4M
899 max sh -c [ -x "$(command -v sw 440.0K 4.0K 129.0K 2.4M
986 max wlsunset -l 52.3409 -L 9.83 68.0K 120.0K 140.0K 2.2M
867 max /bin/sh /usr/share/sway/scr 640.0K 4.0K 143.0K 2.4M
46340 max /usr/bin/zsh 2.9M 20.0K 144.0K 1.9M
923 max sh -c [ -x "$(command -v pl 636.0K 0 150.0K 2.6M
961 max poweralertd -s -i line powe 188.0K 104.0K 159.0K 2.6M
863 max swayidle -w timeout 240 lig 228.0K 124.0K 165.0K 2.6M
43187 max /usr/bin/zsh 3.7M 92.0K 174.0K 1.4M
827 max swaybg -o * -i /usr/share/b 760.0K 124.0K 205.0K 6.6M
43088 max /usr/lib/gvfsd-network --sp 1.6M 172.0K 297.0K 6.6M
1005 max /usr/bin/dbus-daemon --conf 248.0K 196.0K 306.0K 3.8M
43095 max /usr/lib/gvfsd-dnssd --spaw 1.5M 188.0K 319.0K 6.9M
781 max /usr/bin/gamemoded 112.0K 292.0K 321.0K 2.4M
46366 max /usr/bin/zsh 3.0M 8.0K 378.0K 2.4M
1035 max /usr/lib/at-spi2-registryd 688.0K 328.0K 390.0K 6.1M
46369 max /usr/bin/zsh 2.9M 92.0K 451.0K 2.2M
43188 max /usr/share/zsh-theme-powerl 128.0K 224.0K 456.0K 3.9M
999 max /usr/lib/at-spi-bus-launche 596.0K 416.0K 484.0K 6.1M
965 max playerctl -a metadata --for 268.0K 436.0K 488.0K 5.0M
46373 max /usr/share/zsh-theme-powerl 124.0K 312.0K 540.0K 4.0M
1046 max /usr/lib/xdg-permission-sto 276.0K 512.0K 567.0K 5.4M
1025 max /usr/lib/gvfsd-fuse /run/us 492.0K 540.0K 628.0K 5.3M
959 max /usr/lib/dconf-service 120.0K 608.0K 661.0K 5.1M
1011 max /usr/lib/gvfsd 992.0K 624.0K 680.0K 5.7M
1043 max /usr/lib/xdg-document-porta 460.0K 676.0K 761.0K 6.1M
1083 max /usr/lib/xdg-desktop-portal 8.6M 432.0K 790.0K 7.2M
1209 max /usr/lib/gvfs-mtp-volume-mo 172.0K 732.0K 807.0K 5.7M
43067 max /usr/lib/gvfsd-trash --spaw 1.1M 748.0K 896.0K 7.1M
43262 max /usr/lib/gvfsd-metadata 0 828.0K 923.0K 6.0M
912 max sworkstyle -d -l info 828.0K 992.0K 1005.0K 2.8M
780 max /usr/bin/appimagelauncherd 3.4M 632.0K 1.0M 10.7M
889 max foot -c /usr/share/sway/tem 980.0K 1.1M 1.1M 6.4M
1038 max /usr/lib/xdg-desktop-portal 900.0K 1.1M 1.2M 8.7M
1060 max /usr/lib/gvfs-udisks2-volum 1.3M 1.2M 1.4M 9.6M
1094 max /usr/bin/pipewire-media-ses 4.9M 1.2M 1.6M 11.0M
2312 max /usr/lib/firefox/firefox -c 9.1M 468.0K 1.6M 40.3M
790 max /usr/bin/dbus-daemon --sess 236.0K 1.6M 1.7M 5.2M
8277 max Xwayland :0 -rootless -term 27.1M 1.3M 1.8M 10.3M
871 max mako -c /usr/share/sway/tem 8.7M 1.6M 1.8M 11.0M
45575 max /usr/bin/ssh -oForwardX11 n 400.0K 656.0K 1.8M 5.8M
773 max /usr/lib/systemd/systemd -- 2.1M 1.4M 2.2M 6.9M
2807 max htop 324.0K 2.3M 2.4M 5.4M
1757 max foot -c /usr/share/sway/tem 3.1M 1.4M 2.5M 9.0M
1305 max foot -c /usr/share/sway/tem 4.0M 1.7M 2.6M 9.1M
874 max /usr/bin/python /usr/bin/fl 11.3M 2.4M 2.6M 6.1M
45565 max /usr/lib/gvfsd-sftp --spawn 472.0K 2.3M 2.7M 9.2M
2620 max /usr/lib/firefox/firefox -c 10.9M 1.6M 2.8M 37.5M
57708 max htop 0 2.7M 2.9M 6.0M
45573 max /usr/bin/ssh -oForwardX11 n 340.0K 1.5M 2.9M 7.8M
1093 max /usr/bin/pipewire 3.8M 2.5M 2.9M 8.1M
43144 max foot -c /usr/share/sway/tem 3.2M 2.0M 3.2M 10.8M
46304 max /usr/bin/zsh 1.3M 2.7M 3.4M 7.6M
855 max /usr/lib/polkit-gnome/polki 10.2M 3.1M 3.5M 21.3M
43145 max /usr/bin/zsh 1.6M 3.1M 3.6M 7.2M
46302 max foot -c /usr/share/sway/tem 2.7M 2.6M 3.9M 11.4M
983 max /usr/sbin/python /usr/bin/n 23.4M 3.6M 4.1M 21.0M
1174 max /usr/bin/pipewire-pulse 9.9M 4.4M 4.8M 10.6M
848 max waybar -c /usr/share/sway/t 10.5M 6.7M 7.5M 25.4M
2619 max /usr/lib/firefox/firefox -c 17.4M 6.1M 7.9M 45.9M
905 max pcmanfm -d 7.4M 8.8M 11.3M 33.2M
880 max /usr/sbin/python /usr/bin/a 1.3M 11.2M 11.5M 14.7M
57786 max /usr/lib/firefox/firefox -c 276.0K 15.9M 18.5M 94.6M
57748 max /usr/lib/firefox/firefox -c 276.0K 15.9M 18.6M 95.8M
57716 max /usr/lib/firefox/firefox -c 276.0K 15.9M 18.6M 96.2M
2338 max /usr/lib/firefox/firefox -c 24.1M 16.5M 18.8M 89.9M
57807 max python /usr/bin/smem -k -t 0 20.5M 20.9M 24.4M
57605 max /usr/lib/firefox/firefox -c 276.0K 18.2M 21.2M 103.5M
783 max sway 75.3M 11.5M 24.8M 50.0M
5772 max /usr/lib/firefox/firefox -c 26.2M 22.9M 25.2M 97.4M
42497 max python3 /usr/bin/manuskript 64.5M 21.3M 26.6M 44.7M
44467 max /usr/lib/firefox/firefox -c 37.8M 24.5M 28.1M 124.7M
44821 max /usr/lib/firefox/firefox -c 12.9M 25.0M 28.7M 124.6M
44780 max /usr/lib/firefox/firefox -c 11.9M 26.0M 29.7M 124.5M
45035 max /usr/lib/firefox/firefox -c 41.5M 26.5M 30.4M 127.7M
44582 max /usr/lib/firefox/firefox -c 32.1M 27.1M 31.1M 129.6M
2370 max /usr/lib/firefox/firefox -c 27.8M 39.3M 41.7M 114.9M
44368 max /usr/lib/firefox/firefox -c 50.4M 40.1M 43.7M 140.7M
46778 max /usr/lib/firefox/firefox -c 12.4M 40.5M 44.4M 142.9M
2372 max /usr/lib/firefox/firefox -c 28.0M 42.7M 45.1M 117.4M
28983 max /usr/lib/firefox/firefox -c 29.8M 44.4M 47.7M 136.9M
52952 max /usr/lib/firefox/firefox -c 276.0K 44.7M 49.3M 149.8M
2548 max /usr/lib/firefox/firefox -c 181.1M 48.6M 51.2M 125.2M
39201 max /usr/lib/firefox/firefox -c 14.6M 62.6M 66.5M 162.4M
44333 max /usr/lib/firefox/firefox -c 29.8M 63.6M 67.4M 165.4M
45006 max /usr/lib/firefox/firefox -c 79.6M 63.8M 67.6M 166.5M
44501 max /usr/lib/firefox/firefox -c 90.8M 64.2M 69.9M 172.7M
36483 max /usr/lib/firefox/firefox -c 16.4M 71.6M 75.4M 169.6M
55731 max /usr/lib/firefox/firefox -c 276.0K 78.2M 83.8M 188.7M
55680 max /usr/lib/firefox/firefox -c 284.0K 89.6M 97.3M 207.3M
2491 max /usr/lib/firefox/firefox -c 26.8M 100.8M 103.4M 176.3M
53924 max /usr/lib/firefox/firefox -c 284.0K 111.7M 119.4M 230.1M
55061 max /usr/lib/firefox/firefox -c 284.0K 127.6M 136.6M 249.6M
3000 max /usr/lib/firefox/firefox -c 29.2M 180.6M 183.9M 261.1M
2256 max /usr/lib/firefox/firefox 123.5M 290.7M 301.8M 400.0M
-------------------------------------------------------------------------------
116 1 1.3G 1.9G 2.1G 5.3G
$ free -h
gesamt benutzt frei gemns. Puffer/Cache verfügbar
Speicher: 3,7Gi 2,7Gi 146Mi 351Mi 908Mi 452Mi
Swap: 9,8Gi 1,3Gi 8,4Gi
Sway ate all my RAM! ~25 MB! That is too high! No… Firefox is not the problem at all, it is sway! 
Okay a bit irony… but you see that firefox is the greedy application here and you are not the only one seeing that. 
Well yeah… it is a 4GB RAM Laptop with a dualcore Atom CPU . it still works, so I use it. Most of the time I connect via remote session to my workstation. I like that laptop because it has a working video acceleration and is fanless, so it is neat for writing.
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