Added some images to the kits, now its lagging everytime u open the kit gui thing. 
Done this before with the same Images and it never lagged. (not 100% sure if it is this plugin) 
heres the kit data file where all the images are.>> https://pastebin.com/YDCjgmtD  

its all them kits u have :)
Sorry cant be no help though

ah okay, thnks anyway :) 

Merged post

explains why it didnt lag last time i did this, i didnt have all the custom kits :'D