isn't working – slows down front-end

same complaint as a few other have for the last several versions – it isn’t finding any broken links and status always says it’s scanning

No broken links found.
No URLs in the work queue.
Searching your blog for links...

Broken (0) | Redirects (0) | Dismissed (0) | All (0)

i’m running on a shared server that preforms well, but slows down significantly when BLC is enabled – both the front and back end

debug info…

PHP version	5.4.15
MySQL version	5.1.68
CURL version	7.24.0
Snoopy	Installed
Safe mode	Off
open_basedir	Off
Default PHP execution time limit	30 seconds
Resynch. flag	1
Synch. records	112
Unparsed items	112
Link records	0 (0)
Installation log	Plugin activated at 2013-07-09 02:38:12.
Installation/update begins.
Upgrading the database...
Database schema updated.
Database successfully upgraded.
Cleaning up the database...
... Deleting invalid container records
... 0 synch records deleted
... Deleting invalid link instances
... 0 instances deleted
... 0 more instances deleted
... Deleting orphaned links
... 0 links deleted
Notifying modules...
... Updating module cache
... Notifying module "http"
... Notifying module "link"
...... Parser "link" is marking relevant items as unsynched
...... Executing query: UPDATE db_blc_synch SET synched = 0 WHERE (container_type = 'page' AND last_synch >= '2013-07-09 02:32:52') OR (container_type = 'post' AND last_synch >= '2013-07-09 02:32:52')
...... 0 rows affected
... Notifying module "image"
...... Parser "image" is marking relevant items as unsynched
...... Executing query: UPDATE db_blc_synch SET synched = 0 WHERE (container_type = 'page' AND last_synch >= '2013-07-09 02:32:52') OR (container_type = 'post' AND last_synch >= '2013-07-09 02:32:52')
...... 0 rows affected
... Notifying module "metadata"
...... Parser "metadata" is marking relevant items as unsynched
...... Executing query: UPDATE db_blc_synch SET synched = 0 WHERE (container_type = 'custom_field' AND last_synch >= '2013-07-09 02:32:52')
...... 0 rows affected
... Notifying module "url_field"
...... Parser "url_field" is marking relevant items as unsynched
... Notifying module "post"
...... Deleting synch records for removed posts
...... 0 rows deleted
...... Marking changed posts as unsynched
...... 0 rows updated
...... Creating synch records for new posts
...... 0 rows inserted
... Notifying module "page"
...... Skipping "page" resyncyh since all post types were already synched.
... Notifying module "dummy"
... Notifying module "youtube-iframe"
...... Parser "youtube-iframe" is marking relevant items as unsynched
...... Executing query: UPDATE db_blc_synch SET synched = 0 WHERE (container_type = 'page' AND last_synch >= '2013-07-09 02:32:52') OR (container_type = 'post' AND last_synch >= '2013-07-09 02:32:52')
...... 0 rows affected
... Notifying module "dailymotion-embed"
...... Parser "dailymotion-embed" is marking relevant items as unsynched
...... Executing query: UPDATE db_blc_synch SET synched = 0 WHERE (container_type = 'page' AND last_synch >= '2013-07-09 02:32:52') OR (container_type = 'post' AND last_synch >= '2013-07-09 02:32:52')
...... 0 rows affected
... Notifying module "vimeo-embed"
...... Parser "vimeo-embed" is marking relevant items as unsynched
...... Executing query: UPDATE db_blc_synch SET synched = 0 WHERE (container_type = 'page' AND last_synch >= '2013-07-09 02:32:52') OR (container_type = 'post' AND last_synch >= '2013-07-09 02:32:52')
...... 0 rows affected
Updating server load limit settings...
Optimizing the database...
Completing installation...
Configuration saved.
Installation/update completed at 2013-07-09 02:38:12 with 27 queries executed.

http://wordpress.org/extend/plugins/broken-link-checker/