Loading a presentation which I've used / given before on my Core 2 duo laptop (yeah the machine is getting a bit old) which I've recently updated to Fedora 17 (and is fully up2date as of today). I notice that loading the presentation takes a significant time, I can actually see some parts of the slides being drawn bit by bit (images first show up as a broken image like icon, then later get loaded). The images in question are the Fedora logo from one of the standard Fedora presentation templates: http://fedoraproject.org/w/uploads/8/85/Fedora-designninja-presentation-submission.otp So this is not an image heavy presentation (at leas I don't think so). This presentation used to load a lot quicker in F-16 and older.
p.s. libreoffice version: libreoffice-core-3.5.2.1-1.fc17.x86_64
due to an unfortunate interaction between the spec file setting CFLAGS/CXXFLAGS to something that does not include any optimization flags, and the LO build system in 3.5 newly respecting CFLAGS/CXXFLAGS passed to configure, the 3.5 versions up to 3.5.2.1-3 were built without any compiler optimization. please try if your performance problem is gone in version 3.5.2.1-4.
I tested with 3.5.2.1-5.fc17 and the speed seems back to normal.
libreoffice-3.5.2.1-6.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/libreoffice-3.5.2.1-6.fc17
libreoffice-3.5.2.1-6.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.