I spent a while riding with M530 SPD’s and my MTB shoes on my road bike, couldn’t afford some nice pedals and shoes at the same time as I bought the bike! Besides, it was winter, and have Gore Tex boots to keep my tootsies warm.
Got hold of some Look Keo Max’s cheap and some SIDI Genius 5 Pro shoes, and immediately, the performance difference is hugely noticeable. My avg speeds have gone up, and I’m faster up climbs. You don’t think they’ll make a big difference until you swap!
And clipping in to single sided pedals is a PITA, but you get used to it.