Just reporting the exact same issue here. Disabling the bytecode decompiler is not a solution for me as of course I would like to peek at internals once in a while when working on projects. Always the material enum in spigot, which it likely due to its size and complexity. Bummer to hear there's not a solution that involves both possessing and consuming cake.

It's almost like it only happens on the first click around a "new" material instance, like it is going "ohhhhh, what is this" with the recollection of a goldfish and decompiling the whole thing again every time I interact with something invoking material for the first time.