"It's a much more complex vector based imaging process..."
What that means, as vector based, the application is large(needing the overhead) , yet, creating small file sets. Where, for bitmap, an application is small, however, the created files (bitmaps) are large....leading us to compression techniques to tie um up.
Vector based images allow for fast down loads, where bit mapped images, depending on Internet connection, can take for every.
The Vector based animation was devised to get past the slow phone line dial up connections allowing faster down loads.
doni