According to mon.itor.us weekly benchmark report for 20 top websites (by Alexa) the best response time for US and European markets was demonstrated by google.fr followed by google.com. The worst response time was demonstrated by www.baidu.com, Chinese search engine. Obviously they are not much concerned about their user experience from the United States and Europe. The following companies also show bellow average response time: www.yahoo.co.jp, www.hi5.com, www.friendster.com, www.msn.com, www.facebook.com, and www.youtube.com.
In uptime category the worst results were shown by www.friendster.com (98.6%). The following sites also were bellow average: www.facebook.com (99.5%), www.youtube.com (99.8%), www.hi5.com (99.8%).