[GP20]Why it is slow to show a page when showing a PDF file by USB reader?

"Because GP20 is using software decoder, so the performance is not as good as a computer.
The more fancy or complicated the page, the more slower it could be.
For example a page with graphics, tables and picture will be much slower than a page with just letters.
This is the limitation. Suggest to play the file on a computer and displayed by the projector."