What's the most efficient way to prevent an area from being destroyed?

Good day! I'm currently working on a minigame where I want players to place blocks while at the same time prevent them from breaking the map blocks. Right now, my current method is to clone the area and constantly check whether those two areas match and only re-clone the area if they're a mismatch. Issue is it heavily lags my game, a lot of red spikes in the TPS section in the debug screen which I expected. I'm asking if there's a better way to do this and make it less laggy?