Wow 3 million?! Read this: http://learn.elgg.org/en/1.10/admin/performance.html#can-elgg-scale-to-x-million-users

hi all

Thanks for your time.

@Juho Jaakkola: is there any way i can load-test elgg?

@VGNtl: I have choose elgg because its easy, powerful and fast. Also elgg is the ready-made php solution for a social network, what just i need to do is, program a plugin and use elgg methods. Do i need to choose something different?

@manacim: Thanks for reminding me the documentation page ;-)

@saqib

Like the doc page says, depends of your infrastructure. My recommendation is to start with something not so big, and when your elgg network grows, switch to a VPS or Dedicated.