Comment 4 for bug 1021815

Well, looking deeper into the problem it looks as Inkscape is building a fontconfig/cache in the temporary directory. If this folder is present the preview is shown immediately. If it doesn't, opening any pdf takes all those disk reads until the preview is shown.
It turned actually out that I got this observation the first time (only the first) with a new clean Inkscape version (of course), but every time I started with the portableapps.com version. It looks that that portable version removes the cached font directory every time after closing the program.

Looking at the new facts there remain two open questions:
- Can you improve the bad first time experience? Maybe by building the font index at the first startup, indicating that the font-cache is being read. At least you should indicate that time-consuming process somehow
- How are those portableapps.com versions generated? According to http://es.dev.inkscape.org/download/ they seem to be kind of "official" builds