Alinks Not Working With Paging Module

I have 2 issues:
1.I realised this module uses the nodeapi hook and it executes every time someone opens a node...I am concerned if this could be a disaster when scaling the website to a few thousand users and having a few thousand terms linking so is there a way to make cron handle this or am I being too concerned about this when its not that big of a deal.
2.As the title says it links to itself when a keyword is present in the body of the node it is linking I was thinking on avoiding this by placing a conditional where if $alink_url != my own url then replace the word but this works fine for normal nodes but how about unaliased nodes?? like node/XXX insted of bla-bla/nice-alias its bad for SEO.