Windows design style

I was wondering if a windows design like a commercial style windows straight up or even a reverse angle would affect the sailboat speed compared to a sleek sporty angle windows ?

 

Depends on what and where. As far as additional wind drag, any design is a relatively negligible change in magnitude for a sailboat (i.e. draw your expected wind angles and velocities). As far a fouling lines or sails on a tack or jibe..... or making your way around the deck..... or trapping green water in a knockdown or wave boarding event....... it all depends...