Piwik Multisite implementation


I am planning to use multisite to store all the data for my sites.
The analytics data that is going to be created is going to be huge.
The question is :
Is adding multisites to one piwik install useful in the sence of speed ?
Or should i make multiple installs so that the databases are completely different and it would work much faster?

please let me know, any help is appreciated.