问题：
When installing Windows services there are two options for automatically starting a Windows service on Windows startup. One is Automatic, and the other is Automatic (Delayed start). What is the difference between these two in detail?
回答：
In short, services set to Automatic will start during the boot process, while services set to start as Delayed will start shortly after boot.
Starting your service Delayed improves the boot performance of your server and has security benefits.
Update: "shortly after boot" is actually 2 minutes after the last "automatic" service has started, by default. This can be configured by a registry key:
The registry keys of interest (At least in some versions of windows) are: HKLMSYSTEMCurrentControlSetservices<service name>DelayedAutostart will have the value 1 if delayed, 0 if not.
HKLMSYSTEMCurrentControlSetservicesAutoStartDelay decimal number of seconds to wait, may need to create this one. Applies globally to all Delayed services.