How viable is it to host a Jellyfin server on your main PC?

[Fiddler]

Hey! I've been thinking about setting up a Jellyfin server for the shared flat I'll be moving into. Now, I do have a pretty beefy PC and using it to host the server seems like the easiest way to go. But I do have a couple questions.

1. How does streaming impact performance? I imagine not too much, especially when direct playing.
   
2. Is there a way to preserve power when the PC is not in use. I normally just shut it down completely, which obviously won't be an option anymore. I know I could activate "wake on lan" but I'm not sure yet if having a Lan connection will be viable.
   
3. Is there anything else I'm missing? Most people seem to be building their own NASs.
   

The other option I woul have available is using a Raspberry Pi tho it looks like performance might become a problem?
Thanks in advance!