When I restore a snapshot the computer cannot be used, it is very very slow, I do not think it is a problem with the CPU since it is a fast computer, nor with the 16 GB RAM, I think it is due to the disk writing speed that saturates it
Nobody can see what you are doing and what are details of your setup. So impossible to guess what can be responsible for this behaviour.
You can try to limit number of CPU cores restic is using. If you use for example only one then all should be much slower.
Now because it is restore I would not spend too much time on it. You do not restore everyday. It is one off process you might even never run.
If it slows down your computer just take a break until it finishes.
You are also right. Thanks for everything. Greetings