Same here! 
(on El Capitan 10.11.6, Quad Core CPU, 8GB RAM, MacBook Pro, Safari 10.1.1)
No software has “ever” forced Safari to issue a message like that in last 4 years of my macbook usage. But this version of Kite is exceptional!
It is a CPU and memory hogger compared to previous one, which was smooth as silk on my system.
New version of Kite seriously needs attention!