How can I find out what the most lightweight terminal emulator is?

I am trying to reduce the disk space by my system, by removing packages I don't or rarely use, as well as the RAM needed for my programs and background tasks. I need the terminal mostly for displaying various things (calendar, actual time, output of some shell/bash commands, etc.). I'm using gnome-terminal right now, but this ought to be done smarter (here: more resource efficient). Mainly, I don't really need a colourful output, so I thought about xterm doing this, but I couldn't manage transferring the command(s) I'm using with gnome-terminal to another terminal emulator. The first question would be here: How can I find out which is the most lightweight terminal emulator for use with a window manager (not a full desktop environment)? Here's a code snippet from my rc.xml of my window manager openbox: true sh -c 'echo "$(date)\t\tbeginning of session lock" >> ~/.lock.log; i3lock -uc 000000' true Kalender no gnome-terminal --hide-menubar --window-with-profile=calendar --title='calendar month' --geometry=66x9 -- bash -c 'ncal -C3; read -sn1' true lxterminal --geometry=40x32 -t "To Do's" -e "vi ~/todo" I rewrote the code for very simple commands like the first shortcut, but I didn't manage to "convert" the second shortcut into the form of the third one.