When I do a find, we get a new cursor from mongo.

I never close these cursors, i leave it to mongo to handle everything.
But if I 'force close' the cursor after every find (since i never re-use it and i have thousands of finds per second), will that improve performance or it just doesn't matter ?

Also is it worth implementing logic to re-use a cursor (because technically i do 'very similar queries' over an over again) ? Or getting a new cursor is extremely fast and not expensive at all ?