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PDF is a container...it can contain text, and/or images.
Images could be any type of bitmap: gif, jpeg, png, and/or vector type images.
A PDF can compress data to a smaller file size by converting parts into other formats.
A vector image could be converted into a bitmap (for example), if the settings are set that way.
Depends on how much the file needs to be compressed (by the author).
A vector artwork file can be resized (bigger or smaller) without any quality loss.
But changes can occur if certain elements are not converted to other formats.
For examples line thicknesses can stay the same, even as you reduce the vector artwork,
resulting in really thick looking lines...the artist needs to convert those lines to fixed objects so they adjust with the image resizing.
PDF saves often include converting lines and artwork for that reason.
But all this has nothing to do with your problems.
You made a statement about files opening quickly when you weren't connected to the internet.
And files taking a lot longer to open (or print?) when the internet is connected.
This tells me that your computer is just slowing down by the internet connection.
A harddrive problem exists all the time, so I doubt thats your problem.
You may need to examine what is running and eating up PC power when you are connected to the net.
Have you fully scanned your computer for malware and viruses?
You need to use varied software for this, and not just basic free antivirus.
Some programs run in the background when they don't need to, so you need to check what is in your Startup menu and background processes.
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