Why does Defender turn my wpadmin into a slug

I installed and activated your new plug-in Defender today on my site and it turned my admin page into a slug(speed wise)
I can log into wp-admin fine, I can browse to most any menu item and they open rather quickly
I click on the Defender menu item and everything else becomes PAINFULLY slow
I wait, I wait, then I wait some more
infact I wait so much I try to log out, then I get nasty database error connection message
and database error is so bad sometimes, it has taken down my site
If I get tired of waiting to log out, I have to close browser window

Everything seems to come back after a bit and I can log back-in
and again browse to any menu item, until I click on Defender

Any ideas what to try?

Thanks