I've noticed some major issues when grabbing shulker boxes filled with items, buckets of fish/axolotls, and enchanted items.

It appears items that have NBT data associated with them causes the games framerate to drop. It's not majorly noticeable with enchanted items, but with full shulkers the game will go from 75 FPS (my refresh rate) down to 30 FPS, and with buckets of axolotls my framerates drop as low as 10 FPS.

Steps to reproduce:

• Fill a shulker box with a variety of items, capture a fish or axolotl, or enchant a weapon with several enchantments
• Attempt to move the item in your inventory manually, NOT via quick move
• Note the framerates drop harshly