Hello, I'm a community developer, and I recently did some tests when I was studying the problem of too high MSPT occupancy of the hopper. I used the hook function method to test the execution time of  some hopper-related functions.

After observing the test results, I annotated a function called Hopper::_isFullContainer,In most static case(non item pull in or out), the main run time of hopper tick is on this function.

I know that your intention is to determine the hopper situation in advance, so as to reduce the execution of some codes. But unfortunately, your optimization did not have a very good effect due to the low execution efficiency of this function. When dealing with items with nbt, this mspt occupancy is more obvious.

So I hope you can try to optimize the code of this function to improve its execution efficiency. 

Here are some of my test results:

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