I've been running a few sites on Hetzner Cloud's ARM machines and at a guess I'd say performance is extremely close on the 4 core ARM to the 4 core Intel / AMD,

I've been running a few sites on Hetzner Cloud's ARM machines and at a guess I'd say performance is extremely close on the 4 core ARM to the 4 core Intel / AMD, and it's a quarter of the cost. I've not seen any issues with them at all either. The bonus is that, being far more energy efficient, they're theoretically greener too. I wonder what the carbon savings would be if every server switched to ARM?