I've been working all the day long on a video project using the VSE. I am using very low def footage (720 x 406). The editing was mainly finished and Blender was working fast (playback 24fps).
Then, suddenly, it became incredibly slow (4 sec for one frame). I saved, reboot, open it again but still the same. When I open an other project, even an heavy one, everything's fine. But this one keep bugging the rendering.
Any idea why ? A solution ? Thank you very much !