Your question of "better performance" can be yes or a no, depending on what you're after. Engineering is a management of compromises. Understanding the pros and cons of a biplane design will prove that the disadvantages usually outweigh the advantages, but perhaps not- again it depends on what you're after.
Engineers have learned things over the last 100+ years- Stacked wings will not generate twice the lift of a single wing, their aerodynamics interfere with each other BUT you will absolutely get more lift than a single wing of the same span.
Remember wingtip vortices kill lift, and you'll have four wingtips. Stacked wings always add drag. If you have two cantilever wings you could reduce the drag from whatever struts and wires you eliminate over the older designs, but it will still have more drag of all sorts than a monoplane. You might like simpler wing design as biplanes have greater STOL performance without flaps, The compromise here- you'll have a tougher time handling that much wing in a crosswind.
Flaps give you flexibility of higher lift and a lower stall without so much wing area. Plus you'll really need to slam the stick forward if you have an engine failure, these planes really slow down fast.
Back in the day biplanes were hard to beat. The first monoplanes had just as many wires, the first cantilever wings were poorly made and killed a few people, which made pilots deathly afraid of them. Change is hard to push onto people when the tried and true works so well like good lift and high strength, but the solutions are so well understood today the biplane's only advantages are maybe some margin of higher strength, Easy inexpensive strength, greater lift in a given span, short wings roll faster and an awesome look and experience.
Novelty can be fun, and you do gain some things with trade offs. I'd say don't quit if you like the idea, do it. They certainly do fly and can fly well, and you could improve on it. If you just want to fly Cable trussed biplanes give you inexpensive, easier to design strength. You might have a lot of fun- but you won't improve fuel economy, safer ground handling, speed or a longer glide.