Crypto used by IPSec (aes, sha) is often accelerated by hardware - and the above mentioned Ubiquiti has hardware for that. Chacha/Poly used by Wireguard are not.
Of course, benchmarks from random strangers are not gospel, and the results aren’t particularly damning. But even then, you’re assuming that you have the luxury of running on a chip that comes with a hardware crypto engine. Good luck trying to get AES encryption/decryption speeds at anywhere near line rate with a Raspberry Pi or a run-of-the-mill router.
