Version: (using KDE 4.2.4) OS: Linux Installed from: Debian testing/unstable Packages While hovering with the cursor a big PDF file, Dolphin (and Konqueror of KDE 3 and 4) may freeze for many seconds (even 30). This only happens only the first time when hovering, and will not repeat for a long time. This behavior has been with Konqueror since long ago. Unfortunately, I can't point to any gratis PDF online, if you don't manage to get one, I'll upload one somewhere. A good start point is Wikibooks.
*** This bug has been marked as a duplicate of bug 190600 ***