am Just a Junior designer,after the struggle with my Cs5.5 taking hours of rendering i stumbled nto some guys comments from the forum and made things super easy for me…, i did the following:
1-used an external drive (terror) for storage(export)
2-made sure my macbook Air had enough space
3-on my export settings i made sure that the source range is n the entire sequence form
4-deselected the use maximum render quality ,use previews,use frame blending
5.work with less crazy transitions like dissolve and others
im so happy with my Cs and im rendering videos fast,i hope this will help,any video format mpeg.mts etc