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So...How many new pages a day should I add or make change?
Also does making changes (rather major changes) hurt your ranking?
But I very seriously doubt that simply adding pages alone will cause your traffic to drop.
It is more likely that in the process of adding the new pages and intergrating them into the navigation and content structure of your existing pages you made some other changes which caused the traffic drop.
Maybe the changes make your old pages rank differently after the changes, so less traffic.
Maybe the new pages result in less multiple page visits, less page views.
Maybe content or navigation changes make it harder for visitors to find what they are looking for, less page views.
I seldom add just one page at a time. Normally I add 10 to 50 pages and have never seen a problem as a result of the new page additions. I don't add pages every day though, once a month is more like it for me.
I do update pages several times a week though, often changing 10 to 50 pages each time.