Hi, I recently upgraded from 4.19.97 to 5.4.28 and I noticed that bird was using a lot more CPU (about three times). On those two graphs you can see the CPU usage and when I rebooted: https://pix.milkywan.fr/gallery#ugO0qVvx.png,ncr9kHfi.png I rebooted to 4.19.113 and now I’m back to the ~10 % average CPU. My router has 5 dual-stack fullviews (2 are from RRs), a dual-stack OSPF and BFD on OSPF and on the RR sessions. I also upgraded my RRs, but I don’t see any change on them, so the usage might be related to FIB/kernel route insertion. I don’t have other BGP implementation on my network, so it might be a kernel bug and not a bird one. But on the other hand, I was clearly seeing the bird process using a whole CPU core with htop. I can share my .conf for each kernel if it’s helpful. Regards, -- Alarig