The demo that zooms in and out of a PDF is much faster than it would be with CPU rendering. When you zoom in and out in an existing PDF viewer, it takes much lo

The demo that zooms in and out of a PDF is much faster than it would be with CPU rendering. When you zoom in and out in an existing PDF viewer, it takes much longer than 1/60 sec to re-rasterize the page. The CPU takes a long time to rasterize fonts. It only seems fast because the glyphs are cached. If you need text drawn in so many different sizes, like in that demo, the cache is not as effective.