You can look at this site that is testing Twister.
Obviously the results are for June 2009 and besides Twister are included other Av's.
The testings are for each day of June 2009.
The samples aren't many and they are Chinese.
Google translation :
http://translate.google.com/translate?h ... %26hl%3Den
Original post :
http://bbs.kafan.cn/thread-491981-1-1.html