Regular web-proxy contains Squid proxy. Webproxy-test package contains our own written proxy engine with caching abilities. You can find the configuration of the new proxy in the 'ip proxy' menu. The documentation isn't ready yet. Since it is a test package there could be some bugs, if you find something please report to support@mikrotik.com
Is any body using webproxy-test-2.9.npk I wanted to try it, after uploading the package I lost my normal webproxy package and didnt see any repalcement nor the webproxy-test-2.9.npk.