Some things with this mod can be resource intensive if not set up correctly. This section will give some advice on how to get most out of your bees without it dragging you computer down.
Bees being entities in the world and not just a block or item will inherently use more resources. A big resource hog from entities is pathing and AI of which bees are not great. To prevent unnecessary AI calculations, make sure all bees have a place to live and their required flower block. Also keep the bees in an enclosure that's not too big, or they will start wandering off. Alternatively you can use a simulator upgrade in the hive to prevent the bee entities being in the world.
Another resource hog can be the comb rendering in centrifuges. If you have a lot of centrifuges running, consider turning off the comb rendering. The option can be found in config/productivebees-client.toml