Sorry that your upload is slow. Without seeing the layout of the project it's only a guess that VP memory is being maxed out. The 64-bit release should remedy that (no target).
Many suggestions have been offered in other threads, such as exporting as lower resolution, breaking up the project, consolidating tracks, pre-producing looping segments, and how best to apply global effects.
You can test various releases, as memory handling has changed from time to time. This version has proven to be dependable.