Problems with fast web view and really large PDF files.

If "allow speculative downloads in background" is set then the Fast Web view becomes nonfunctional. Reader is makeing the HTTP Byte range requests but will ask for almost the entire PDF file in one range (180 MB of the 182 MB file).
If "allow speculative downloads in background" is not set then Fast Web view is working fine, Reader is making more HTTP Byte range requests but the larges ones are still small 20K or so.
Is this behavior being experianced by anyone else?
What are the disadvantages, if any, of having "allow speculative downloads in background" turned off?
My environment:
182 MB pdf file (Optimized) around 41,000 pages. I have also seen this with 42 MB and 25 MB pdf files.
IE 6
Reader 9.2
Apache webservers (On Solaris Apache 1.3.20 and Linux Apache 2.0)
Thanks in advance
Angus Laidlaw

Hi,
The signing tool use Capicom (Library from .NET) to generate attached digital signature. I also tried signing with .net class SignedCms but the result is the same. What I don't understand is why some PDFs are working and others are not.
For example, I uploaded here a signed PDF which can be opened up succesfully: http://dl.dropbox.com/u/104591126/PDFs/Signed_Dummy1.pdf (it is the same PDF but I didn't enable the fast web view)
Can you suggest other signing method?
Thank you.

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<part name="parameters"
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<input message="tns:DocumentOperations_getDocuments"
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<input
message="tns:DocumentOperations_getSimpleDocumentInformation" />
<output
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<soap:operation soapAction="" />
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<soap:body use="literal" />
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<soap:body use="literal" />
</output>
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