D.R.T. Allows
the user to monitor how well multiple proxy servers are performing. This feature
can be accessed by pressing the F12 button or by selecting "View->Proxy
Usage Report".
Proxy server
cleanup is done automatically by default, meaning that proxies with failure
rates above 85% get removed automatically. Note that at least 10 queries must
be made using a specific proxy server before it can be considered for deletion.

The Proxy Usage
Report can come in handy in identifying the quality of proxy servers at scan
time. For example, viewing the report will show all currently active proxies,
how many queries were made using those proxies and the failure rate for each
proxy expressed as a percent.
With this information,
proxies with high failure rates which normally slow down the search process
significantly can be identified.
Note that the
"Remove High Failure Proxies" button will only work on proxies queried
10 or more times. At least 10 queries are necessary before a proxy can be
disabled.