How fast are PubSub?

Hi,

I plan to use PubSub to store many thousand of informations, before lost many hours of developpement, is PubSub fast with lot of information ?

To be exact, I plan to create a hundred PubSub with 8-10 item in each node. And I want to be sure all pubsub will be faster. I saw on a website that ejabberd can be slow with lot of PubSub, I don’t want the same problem with Openfire.

PS : For my use, I will create at least 2 pubsub per room. Saw we can imagine for 100 active rooms we have 200 pubsub contening approximatively 8 items each.