I have not really noticed D7 being any slower, but some people say it is.
I will not start any more D6 installations, and have not since last Fall. If you can't identify a key module that is not available in D7, I would not even consider D6.
Nancy
Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.
From: Austin Einter
Hi Drupal Experts Is there any performance comparision data available between Drupal 6 and Drupal 7. If somebody need to start a developemnt for a big site (involving huge database operations, search engine tika/apachesolr etc), which one is recomonded D6 or D7.