Thank you for the battery assessment - this looks promising. Is the Bluetooth needed for the pen or were you using it for something else, such as headphones?
The performance with opening PDFs is a bit concerning - my very old Sony DPT-S1 tends to perform very well with any files I send its way, albeit mine are scanned copies of my physical books generally; I'll keep the PDF optimization tips in mind - I have tended to use ghostscript [1] to reduce ebook sizes with adequate success but you're right that performance of opening in pdf readers can often be strange for downloaded pdfs. Thanks again for the help.
[1] gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.9 -dPDFSETTINGS=/ebook -dBATCH -dNOPAUSE -sOutputFile=output.pdf input.pdf
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