Recently there have been a lot of users on my plex and the server just isn’t up to it anymore than 3 people and it stutters like fook.

now my budget would be tight so is there a pc setup I can add 4 or more drives that can handle plex better?
im looking at £300 max I know it’s not much but the boss would kill me as it is.
it would need to be cased and ready to go not adding bits here and there as I don’t have the time.

cheers guys.
TJ