For the start menu, I'm guessing this is either hard drive latency or network latency. The network latency can be particularly bad if you have an intermittent c

For the start menu, I'm guessing this is either hard drive latency or network latency. The network latency can be particularly bad if you have an intermittent connection, like when you connect to a mobile hotspot on your phone from a moving train, the start menu can hang for minutes. It would literally be faster to reboot the computer than to wait for the start menu to popup.