Single Page loader PDF reader in PHP / Ruby / .NET - pdf-reader

I've very large sized PDF files. I want a PDF reader (PHP / Ruby / .NET) that does not load the whole file but just the page so that the response time gets better.
There are many PHP and .NET PDF readers but I'm not sure if they just load a page or load the whole file at once.

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Caveats:
The website uses a shared cPanel web hosting.
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Thanx to all in advance.