Pfsense-ce-2.8.0-release-amd64.iso.gz — _best_

: Devices with 1GB of RAM or less may struggle with the update process; it is recommended to disable non-essential services before proceeding.

Edit made. added https://www.pfsense.org/download/ for quicker access to pfsense downloads. pfsense-ce-2.8.0-release-amd64.iso.gz

: Denotes the "Community Edition," the free, open-source version of the software maintained by Netgate. : Devices with 1GB of RAM or less

Insert your USB/CD/Virtual DVD, reboot. Enter BIOS to select the drive. You will see the menu. Select "Boot Multi User" (default). " the free

Because 2.8.0 supports THP: System > Advanced > System Tunables Add: vm.pmap.pti = 0 (Only if you are not concerned about Meltdown/Spectre on old Intel CPUs, for pure routing speed).