Fix Raspberry Pi Webcam Freezing Lagging Jittering issue
Follow the steps below to get your webcam back to the way it was if your having any issues with it this should work.
#Open Terminal
Press Ctrl + Alt + t on your keyboard
#install PCI utilities
sudo apt-get install pciutils
#run on every boot
sudo nano /etc/rc.local
#add the command before exit 0
sudo setpci -s 01:00.0 0xD4.B=0x41
#reboot
sudo reboot