highlight this important fact

Author: gorhill

README.md

@@ -4,9 +4,15 @@ See [Change log](https://github.com/gorhill/httpswitchboard/wiki/Change-log) for
 
 A Chromium browser extension which let you whitelist or blacklist requests
 originating from within a web page according to their type and/or destination
-as per domain name. As of April 2014, the extension comes with preset
-blacklists totaling over 56,000 distinct hostnames (these lists can be disabled,
-or more can be enabled).
+as per domain name. As of May 2014, the extension comes with preset blacklists
+totaling over 60,000 distinct hostnames out of the box (these lists can be
+disabled, or more can be enabled).
+
+Much effort has been spent on creating **highly efficient filtering engines**:
+You won't find blockers out there which come close to that kind of efficiency
+memory- and CPU-wise. Result: HTTPSB can hold tens of thousands more filtering
+rules in memory while having a smaller memory footprint than the "leaner" blockers
+out there.
 
 ## Installation