What makes some models export FBX with morphs faster than others?

nokoteb99

I'm exporting FBX and even though i have the same morph export rule which is  head EXPORT.......some exports are fast and with some other characters the exports are super slow. Even if the character is naked with no clothes. Is it the Texture that is at fault?

I pretty much use the same G2F mixed with  a custom body morph i bought and that's about it.