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Is there a downside to adding metadata to a PDF?
Is there such thing as "too much" metadata? Does metadata contribute to overall file size? Could too much metadata result in slower download time?
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There is no limit to how much metadata can be in a PDF file. For certain PDF subset standards such as PDF/X, PDF/A, and PDF/VT, metadata plays a key role.
Metadata isn't free! Every byte of metadata adds one byte to the PDF file size and the larger the file size, the longer it takes to download a file. Duh!!! 
- Dov
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