I'm using an old model "B" and it's working just fine!!!
The CPU load is around 8 and the worse case 10,8%.
The great issue is that it runs with low power consumption (800mA), no heat, no heatsinks, no noise... Just fine!
Got to mention:
My Rpi is set to work only in CLI mode and the total allocated
memory to GPU is the minimum allowed: 16MB (sudo RASPI-CONFIG).
So there's more Megs to CPU.
Congrats to the team, great job!!!
Greetings from Brazil and FORA BOLSONARO!