Has anyone any experience with pi 5 and OpenWrt with smq cake? I just got one as a present for Christmas and i wonder if its worthy buying a 2.5G hut and use it as a router for my 1000/500 or my 500/250 fiber lines with sqm cake.
Also does for anyone with experience with it, does its active fan cooling works with openwrt? does it have auto fan control or runs full speed all time ?
I used one for quite a while before going to x86/64 mini PC. At that time I was using it with SQM I do not recall any bottle necks on an asymmetrical 800/100 connection.
Why would you need a 2.5 G hat if your connection is 1000/500? Try it as-is and measure throughput before adding is my advise.
Yes, the fan is controlled by the firmware on the board so it works independently from the distro. It does not run unless it is needed.
Thank you for your reply, i don't have many options here, r6s are over 240Euro and need at least 1+ month to arrive (if they arrive), and generally any good openwrt compatible router is either not sold here or its cost is out of reach. N100 mini pcs are good but they too are more than 300E and that the ones with 1 nic 
So since i got this and its the 2GB version i think i would save some money and make it a good openwrt router 
i already have a 2.5G network between pcs and i was thinking that it might be useful to add a ssd on the raspberry for fast sharing when a pc is offline, like a small nas but with openwrt and samba.
I was using a Geekworm X1001 on mine. Worked great.
Well I finally found some time and build the Pi 5 Router.
Tested on the 500/250 fiber with sqm cake. It doesn't even feel it. It barely reach 25% cpu usage on one core without even full mhz boost. So it is more than enough for 1GBps.
a short video of cpu usage
Glad it worked out for you. The top of you video is htop. What is in the middle and bottom frame?
It's btop.