Plenty of instructions exist for installing the Adobe 9 PDF iFilter to allow SharePoint to crawl PDFs. I've done this, but my crawls are sloooow. I'm wondering if the v11 iFilter would be faster, but not finding any instructions referencing this. Does it use the same GUID in the registry key, or is it different? Is there any benefit or drawback to using the latest iFilter version?
Adobe PDF iFilter 11 installation instructions: http://www.adobe.com/devnet-docs/acrobatetk/tools/AdminGuide/Acrobat_Reader_IFilter_configuration.pdf
It's using the same GUID as previous versions:
I doubt it will greatly improve the crawl performance. I'd rather take a look at the Foxit PDF iFilter (http://www.foxitsoftware.com/products/ifilter)
After installing Adobe PDF iFilter 11 on SharePoint 2010, we experienced a 7 fold improvement in full scans on our largest content source from 18.5 hours to 2.5 hours. As I understand it, the v. 11 filter has multi-threading enabled, whereas the v.9 filer was running serially. Several "experts" told me that the filter version was not the problem for slowness, but our experience seems otherwise.