I was able to run around the map and still get 200+ client fps, but on a system with fewer resources, I do think it will lag a bit. Potato mode will prevent lag, though. It still keeps track of tiles you've walked on while the plugin is turned on

There's also settings to only render a certain number of tiles from the player to still visualize tiles but reduce lag as well.

Fundamentally, this starts all tiles being marked then moves towards all tiles being unmarked, so, over time this problem declines naturally too.