Hello, my HA run on a Raspberry Pi 4 with 2 GB.
I will switch to a Intel NUC NUC5CPYH with a Celeron and 8 GB RAM.
Is the NUC better and faster than the Pi?
Alternativ i can buy a NUC6CAYH or a NUC7CJYH but there have more Power cunsumation.
The NUC only runs then for HA.
Yes, much.
Just do it and tell us about the celebration, you throw, seeing the speed difference 
Been there, seen that. Never looked back…
If relevant: Buying a device to run Home Assistant (April 2022 edition) - #15 by kotrfa
Btw. switching from RPi to a regular PC was like a night and day. You should do it.
I have now buyed a new NUC7CJYH for 110€…
A 250GB SSD and 8GB RAM lying around.