Large World File Size (above 50 MB) causes World Generation Lag

When I play a large map like Hogwarts Map, the game would lag in a very annoing way. This happens to be in ANY gamemode in the Bedrock Edition, and does not matter. Even a world size above 50 MB would cause the game to lag. The world that I am using is only around 90 MB, and is lagging the game seriously, world generation lag needs help.