The transition from D5 to D6 was hard for us. We are now doing D6 to D7 and it is much harder. D8 is in progress and when released D6 will not be supported. Unless yours is a very small site or you expect it only be around for 1-2 years, D6 is an alternative. Otherwise go with D7.

On Thu, Sep 20, 2012 at 7:28 AM, Gerald Klein <jk@zognet.com> wrote:
Although I have found 7 to be slower then 6, the improvements are worth the trouble. If you use an opcode cache like APC, you can negate some of the extra bootstrap code that causes the slower response. Depending how often code changes using something like Varnish will help also. 

--jerry

On Thu, Sep 20, 2012 at 6:24 AM, Austin Einter <austin.einter@gmail.com> wrote:
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.
 
Thanks a lot.
Austin

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