Check your devices in Device Manager. If the Intel Management Engine is listed, disable it. This has no affect whatsoever on your system and in fact disabling the device doesn't really disable Intel AMT (Google it if you want to know what it does - it's a tool on the processor that allows very high level support to interrogate your system for issues).
I found that after the BIOS update the device was not running correctly, causing my bootup times to go from 5-10s to 5 minutes (or more). Disabling the device fixed all my issues, including sluggish performance after the PC had booted up.
System : Dell XPS 8700 Processor upgraded to i7 4790K (with Cooler Master Vortex Plus installed + Arctic MX-4 thermal paste) Power Supply upgraded to EVGA 650 GQ, 80+ GOLD 650W, Semi Modular PSU RAM upgraded to 16GB Crucial MX300 525GB SSD + 1TB HD GeForce GTX 1050 TI SC