Hi, Frank.

> I believe much of the performance problem is that some versions of
> GDALOpen() do a scan of the whole directory as part of the file opening
> process. In a directory, like Steven's, with 60000 tiles (120000 files!)
> that becomes a significant performance problem.  I have suggested a
> configuration item that might disable this depending on his version of
> GDAL.

That got my attention!

In one dir say I have 20k .png images.  In that same dir I have 400 .shp 
tileindexes which point to them.  I.e. each tileindex points to 50 of those 
.png's.  Are you saying that when I send a MS viz request based on a specific 
tileindex .shp, I could be scanning the whole dir (depending on my version of 
gdal)?

Charlton
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