But what make a CPU good for firewall use.
I use Geekbench for my desktop CPU
http://browser.primatelabs.com/geekbench3/4514496If you go to that page you se alot of parameters test.
What parameter is most important for pfsense in standardmode
What parameters should be good when I use VPN or Squid?If we know that, people could choose the right CPU for their system and be more satisfied.
What makes a CPU good for firewall use is the same thing that makes it good for general computing. Faster (clock speed) is better, if you're comparing CPUs from the same family. More cores? Sure! You can run pfsense on a server with 32 cores and 512GB of RAM and it will be a very fast firewall. But that's clearly overkill.
My most heavily loaded pfsense system is a VM (actually two of them) in a failover pair. They each have a single virtual CPU running on Intel Xeons in the 2.2Ghz range (they're on different hosts with different CPU familes). They each have a single virtual NIC. The hosts have bonded NICs (one has four 1Gbps, the other has two 1Gbps). They route traffic between 6 subnets internally and the internet externally. They also host IPSEC and OpenVPN tunnels between four sites. The WAN at this site is 100Mbps symmetrical. With careful network planning, they are never a bottleneck.
Once again, figure out your requirements first, and you'll be much closer to an answer. Choosing hardware for pfsense is not like buying an appliance. It's a general computing platform that happens to specialize in firewalling and routing. The Cisco ASAs we use for client VPN access are old and run on (I think) pentium 4 technology. But they work just fine in the context they were designed for.