CST1229
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(#10)False, vector still has to be converted to bitmap to be displayed, and if you're changing the sprite's size or using fullscreen the vector also has to be converted to bitmap and stored into memory for each size.
No it could potentially create more lag as every single pixel has to be displayed instead of a vector (which consumes less bytes)
(#4)
It might take up less storage space, but it will take up a lot more RAM when playing back. Whenever a vector is displayed for the first time, Scratch caches the bitmap it rendered from that vector uncompressed in memory - and that bitmap will be very big if it was rendered when the project was in fullscreen. If Scratch is fullscreen on a 1080p monitor, a vector that takes up the entire canvas will use about 4 MB of RAM when it's displayed - a 15 fps animation would suck up 62 MB of RAM per second.