Hi,
I am long time happy user of routeros. But now I have a strange problem. I upgraded old 800Mhz machine (main router) to 3200Mhz machine. I transfered settings by normal export->import (some ques were destroyed but no problem). But since that change the CPU load is growing and goes to 100% in one day. I found a strange solution. If i disable ANY of my firewall filter rules the load goes down to normal 20%

Someone any advice?

PS: I am using routeros 2.9.44

Try to use 2.9.45 version, the best to find out which rule is causing problems for you, disable all rules and enable rules one by one.