The user similarity and item similarity algorithms do not scale well. You need to precompute the correlations. The Duine Framework has support for storing the correlations in a database. Besides precomputation, you also have to make sure that the database access is cached.
Faster hardware will move the limit up, but in the end, with millions of users, you will need a better algorithm...
2009-08-05 13:08:48 UTC in The Duine Framework
