The hashes in the Unicode charts render very slow with evince. For example, see the charts on page 5 or 11 of the following document: http://www.dkuug.dk/jtc1/sc2/wg2/docs/n3580.pdf Some pages may render fast based on pre-computation, but page down further, or zoom in or out, and you will easily run into a delay. It seems that these . I talked to the author of the software that generates the charts, and he said he uses an OS hash or something like that for these hashes: so these are not complicated glyphs. The pages render very quickly on Acrobat reader.
The hash is rendered as a repeated pattern. Poppler seems to draw the pattern using cairo every time instead of rendering it to an image and rendering the image repeated.
Patterns oh patterns that nice rendering slowliness :-/ *** This bug has been marked as a duplicate of bug 13518 ***
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