Build-size questions: my FBX contains 100 anims but I just use one

Hi, as the title already suggests the FBX file I am using contains around 100 animations but I just need one. I am developing a WebGL game therefore buildsize matters a lot. Is unity compiling the whole FBX with all animations or is Unity "cutting-out" all "not-in-use" animations during the compiling process?

Thanks

 

You can use a memory profiler to check that, then you know for sure.