Do you know what program is being used to display it? I don't have an Onyx device, but my PocketBook comes with AdobeViewer and pdfviewer for reading PDF files. Your PDF file works fine under pdfviewer, but AdobeViewer seems to have trouble with it (opening and page turning is very slow, and the CPU runs at 100% even when no pages are being turned). I have no idea why, though.
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