Game question

so ive been reading those tutorials on vectors on tonypas site and im going to make a 2d side view game and for the landscape im going to make it out of alot of vectors

but while i work on it im just gonna ask a few questions about my plans just to make sure i should even do it,

basically i want to make the landscape out of 100 or more vectors on a 600x300 map and i was wondering if thatll be way to much for most computers to handle

ive already made a game exactly like it just without vectors and i got the code to work with a max of around 20-30 bullets at a time and around 20 enemies and the landscape was exactly 100 line segments

so just some feedback on all that would be good, thanks