Using the P3 (Plugin Performance Profiler) I was able to determine that this plugin was making a site that I am managing very slow. I reviewed the code and the only problem I could find was the database query in the get_main_array() method of the quick_page_post_reds class.
I replaced this query with
$theqsl = "SELECT * FROM $wpdb->postmeta a JOIN $wpdb->posts b ON a.
ID WHERE b.
post_status!='trash' AND a.
meta_key IN ('_pprredirect_active','_pprredirect_rewritelink','_pprredirect_newwindow','_pprredirect_relnofollow','_pprredirect_type','_pprredirect_url') ";
As far as I can tell there is no reason to sort these results by post so I removed the order by clause. I also reduced the string of OR conditions to an IN statement which has also been proven to be faster. I also changed the statement to use a join, this optimization is disputable but I have found 9 out of 10 times a join is faster.
After these changes this plugin no longer shows up in the P3 profiler as a plugin using significant resources.
Please use this optimized query for the next version of your plugin.