Why does the game lag after installing the Devious Device?

[Gyurma1]

This is after I used bodyslide, there was no lag before
 but if I put a corset on the character, only the character's head was visible.

Does anyone have any idea what I messed up?

[CaptainJ03]

Invisible Body after using BS is a matter of choosing the wrong output folder. Typically your mod manager needs a kick. Make sure stuff goes to Skyrim/Data

 

Did you install only one version of DDs (5.2 is the current which comes with 4 esp's) or did you search LL for any old instances you can find and installed them too? DDs didn't even lag on my old potatoe from 2014, so something's borked with your setup. A modlist/LO (in a spoiler) might help.