For most problems, no performance gains whatsoever. There's no expection for quantum computers to replace or improve general computing. You can get immense spe

For most problems, no performance gains whatsoever. There's no expection for quantum computers to replace or improve general computing. You can get immense speedups for a very particular set of problems, turning them from "can't possibly complete ever" to solvable; so it would be like an assistive device for these niche tasks, but it would be very important for them because otherwise they're not really practical to solve.