React or Wait

After adding 10000's of pages to the index site has a huge drop

[trimmer80]

I recently added in the relm of 50000 pages to a site.
The pages are a benefit to the user and would likely increase the search engine traffic from long tail keywords.

After adding the pages the site suffered a huge drop in traffic.

I would say that this is either
a) a result of Google being cautious of so many pages added at once or
b) the result of the dilution of PR throughout the site as there are now 50000 extra pages.

I am now wondering if I should put 'no index / no follow' on these pages or just wait and see if it is a temporary drop. Any thoughts?

[Keniki]

I doubt your pages added anything to the net.

[jd01]

If you added all the pages at the same time you might have an issue. Matt Cutts advised adding no more than 5000 pages in a single day (somewhere --- I don't recall exactly where), and I would probably spread the addition out a little more than the 'upper limit' he indicated.

'Noindexing' a portion of the pages or 'Nofollowing' some upper level pages to keep the number of new pages added to the SE index might be helpful, but I have not dealt with the 'over addition' of pages specifically myself, so if there is already a problem I do not know what the exact solution is. It may be an e-mail or re-inclusion request from a webmaster tools account is necessary.

Justin