This MOD looks very fine
Do you think that it is now possible to use it on a live forum ?
Also I have 40000 members in my forum, can we have performance problem ?
I can't recommend that you use this on a live site, as this MOD is still in the Development section, and has not been approved by the MODDB team here at phpbb. That being said, I've had issues with other MODDB approved MODs in the past, and have some 'development' stage MODs running on my live boards with no problems. And aside from some folks with installation issues (BACKUP and BE CAREFUL while editing your files!!!), I believe many sites are using it successfully now.
The v105 version of this MOD uses pagination for displaying the user's map points, so total number of mapped users shouldn't be an issue, as they won't all display at once.