why lag? the current location information is already available for each one at the top of the screen, this will just gather the information of all in a single window.
A simple first suggestion, in the corner of the team window show the total number of online members
I made an image for example:
my second suggestion is to show the current location of each member online.
@Goku Possibility to choose if you do not want to show your current location for everyone.
i made an image for example:
My suggestion is a button so you can organize the box according to available options.
Examples: Pokedex ID, Name, Lvl , Type , Gender, Egg Group..
I made an image for example: