Ok, i think i know why this Mod is taking such a huge CPU load when using very big Files (couple hundred MB or even 1 GB or more). There are 2 ways to add files. One is uploading (adding manually) which is fine for smaller files but of course overkill with File sizes over 1 GB or so.
For that the Import function seems to be there. But, this Import function kinda makes the imported Files downloadable as stream. Which means as far as I know, anytime someone starts a download, the file will be copied from its original location and made ready for the Download. That way making it impossible to get the original Location. Problem is, anytime a download starts to copy for example a file over 1 GB is madness, thats why the CPU is going up in usage beyond normal. If many people would download that file at the same time the Webserver probably would collapse.
So the only way to add files that are that big is with manually adding a file as if one would upload it but then not to upload from the own PC but to enter the link (direct) to the File. Then the download wouldn?t start as stream but get the file from the link entered and works fast. Only problem is, that way the direct link location of that file is easy to find out in the Browser and can be used without actually going through the Website.