This is a very simple mod. It displays the server tick time info, memory usage, a clock and FPS on screen.
It's required to be on the server to use (for server side info), but not all clients have to have it to connect.
The server info can be hidden from non-ops.
There are options to: Always display, only display on F3, or only display when not in F3.
The text can be on the left or right, but by default it's on the right.