Making the file size smaller - Any Tips?

Hi Guys,

A CorelDraw noob here, I really need your expert advice...

My CorelDaw keeps crashing due to my file being HUGE (almost half a gig) - the vectors that I'm using are making my life a living hell. And I'm afraid that if it crashes one more time I will have a mental breakdown.. Do you guy shave any tips on how to keep what I've designed,(i'm making gift labels) but decrease the file size? I'm thinking of turning my vectors into either  a JPEG or PNG and then using them in that format instead of working with them as editable..

Will this work?

Sincerely, 

A nervous wreck