Getting YARPP (Yet Another Related Post Plugin) to work with huge wordpress blog.

Hi,

First of all I just like YARPP plugin as it returns most related/relevant post, however I am having trouble getting YARPP (Yet Another Related Post Plugin) to work with huge wordpress blog as it’s extremely resource extensive even with it’s caching capability it’s eating almost all of resources.So here are my questions :-

1-Is there any way I can optimize YARPP to work with like a million post blog ?

2-Any other alternative plugin for related post that can just lower the server load and work as efficiently as YARPP ?

Regards!