Powerpoint/Openoffice + Presentations

So in one of my classes, I have to do a group presentation. We decided to go for the minimalistic approach, which led to having many more slides in our presentation than normal presentations: 188 slides, which translates to 33.6 megabytes. It seems that both Powerpoint and OO.o Impress have problems with such large presentations. Powerpoint couldn't copy/paste slides correctly between two large presentations, and Impress (2.0) just crashed trying to save in Powerpoint format, every single time I tried. I hate presentation software. It's too bad that it seems that S5 doesn't seem to scale.