adobe acrobat indexing problem

Hi,

I wanted to index about 200 pdf files, so I can more easily and faster look for similar subjects in it.

First i made a map on my mac with the 200 Pdf files.

Then i opened a pdf file an hit the index tool button. It asks me to make a new index , what I do and to include the folder with the files. And also i build the index what takes about 20 minutes.

Then I open a pdf file and choose edit > advanced search. It asks me to include where i want to ask in.

I include the folder i made and hit the Search button.

Although i made an index it still takes very ,very long to search trough all pdf files ( 40 pfd's in 20 mintes)

wich is still to long.

thx,