Why does my search take 60x-70x longer with X or XI than with v9?

When I install Adobe Reader X (v10) or v11, I notice a huge degradation in search speed. I first noticed this last year, and I just re-verified my results with the latest version (v11.0). I don't know if this is unique to my system, or if you might have similar issues.
I am using a wee Acer Aspire One netbook. It has an Intel Atom processor and runs Windows XP SP3 at 1.6GHz with 1GB RAM. I have a set of PDF files in which I search for articles. There are 16 files, totalling 600MB, with about 800 pages in each PDF file.
My test was to use Edit->Search to look for a single word across the entire set of files, with no other options specified. Search returned 14 files with 54 instances. I have a few saved timings:
Adobe Reader v9.1.0     24 seconds.
Adobe Reader v9.2.0     15 seconds.
Adobe Reader v9.4.6     12 seconds.
Adobe Reader v9.5.0     14 seconds.
Adobe Reader v9.5.1     15 seconds.
Adobe Reader v9.5.2     14 seconds.
Adobe Reader v10.1.3   841 seconds. (14m 01s)
Adobe Reader v11.0.0   991 seconds. (16m 31s)
Un-installing v10 or v11 and re-installing v9.5 immediately restores the faster performance.
Any suggestions on what might be causing this difference? I would welcome upgrading to X or XI if this could be solved.

RESOLVED!
The prior poster inspired an experiment. Under Edit->Preferences (Search), I clicked the "Purge Cache Contents" button, and "Poof!", the fast speeds for v9 disappeared and v9 behaved the same I had seen with v10/v11 -- 17 minutes for a full search. After running about 8 full searches, the v9 times dropped back down to 20 seconds! Reader was building indexes to speed the searches.
I reinstalled v11 and clicked "Purge Cache Contents" once more. After about 8 full searches (17 min each), the time for v11 dropped to 20 seconds! When I reinstalled v9, it was immediately quick. When I then reinstalled v11 again, it was immediately quick.
I looked at more forums and read that indexes created by v9 could not be used by v10 and v11, but that indexes created by v10 or v11 would work correctly with v9. Purging the cache contents made sure my v9 cache entries were eliminated, and then Reader could become as quick it was designed to be.
Thanks for your comments.

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