computermagic

The WP Delay Cron plugin will prevent wordpress from running its cron tool for every page view. 
For high traffic sites, this can result in a considerable drop in server load.

WP Delay Cron

Prevent cron from running every time a page is viewed. Good for high traffic sites.

ramon fincken

Plugin to create a (more) stable site when having lot’s of traffic. 
For now: Reduces comments cookie lifetime to 5 minutes 
Removes query strings from files
Coding by: <a href="https://www.mijnpress.nl" rel="nofollow ugc">MijnPress.nl</a> <a href="https://twitter.com/#!/ramonfincken" rel="nofollow ugc">Twitter profile</a> <a href="https://profiles.wordpress.org/ramon-fincken/" rel="nofollow ugc">More plugins</a>

MijnPress high traffic

Plugin to create a (more) stable site when having lot's of traffic

WP Delay Cron vs MijnPress high traffic