Unfortunately pfSense has no interest in creating arm based images. pfSense HAD no interest in porting over to an ARM based version because the BSD kernel was not stable on ARM yet. Since the time of the original answer a few things have changed with the latest Pi hardware, BSD runs on ARM fine and pfSense has been overwhelmed with requests.
PfSense Guest Notes - Proxmox VE Tweaks and tips for better performance with pfSense >= 2.2 on Proxmox >= 3.4. Note: This has been tested with pfSense 2.2 and Proxmox 3.4 (qemu 2.1) Create VM. Download the pfSense 2.2 amd64 "Live CD with installer" ISO .gz (from here), extract (gunzip) and transfer the ISO to your Proxmox server.; Create a new VM: Pfsense for 1Gbps and Full Time VPN - Networking Hardware Apr 08, 2017 Netgate SG-1100 pfSense Security Gateway Appliance
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IPSec Performance on The Vault - Protectli Aug 08, 2018 How to install pFSense on Hyper-V | IT Blog Minimum hardware specs for pFSense can be found here – https://www.pfsense.org/products/#requirements So, minimum is 500Mhz CPU and 256MB RAM, optimal config is 1Ghz CPU and 1GB RAM. 1GB of HDD is required.
Best Hardware for PfSense 2020 | Best Choices
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