Using NavMesh creates serious lag spikes

I recently added NavMesh (as well as NavMeshComponents) to my project, and after doing so the editor often freezes for up to a few seconds. On top of that, while in the game, I have a function that makes my player dash forward. Whenever I perform this action, the game freezes for almost a second. The game also freezes whenever I modify the environment slightly.

My map is decently large, which I assume is not helping, but I feel like it still should not be struggling so much. Does anybody know why this is happening?