NBT Tracker

The NBT Tracker mod adds a special tooltip that displays the size of item NBT tags. This helps identify problematic objects with large data volumes, such as backpacks and shulker boxes, which can create excessive load.

In Minecraft, transferring more than 2 MB of data in a single server-to-client packet (for example, during inventory synchronization) causes the client to disconnect from dedicated servers. When attempting to connect, an error message appears.

It's important to note that this mod works only on the client side and has no effect on the server.