For 0.03 the http tests will use the PHP Client URL (CURL) system rather than fopen if it is available (tested through if the function curl_getinfo exists). This knocks about .2-.4ms off the overall time of http requests.
There is also a new timer class being used which is more accurate for very quick tests.
ICMP also now doesn't include the time required to send the data in it's return so it now operates like command-line ping and is unaffected (generally) by local host delays.
For more detailed information please see the change log.