Sharepoint spins down if no one hits it for a while. You can go into the
Application Pool settings and tell it not to do that.

IIS Application pools are set, by default, to recycle every night
(usually 1-2am timeframe). When that happens, the first user to hit the
site has to wait for the JIT to compile. You could turn app pool
recycling off, but that is not recommended. Alternatively, you could
create a batch file that warms up the JIT every night after the app
pools recycle. Here is a link:

blogs.msdn.com/.../697044.aspx

That makes perfect sense. I will look into having a batch file warm
up the JIT every night after the recycle.