Since Mathematica 10.3 I have found that, in any notebook, the first time I evaluate an information request, for example
?Plot
the response is very slow - usually 15 to 20 seconds. This seems to be associated with a connection to a Wolfram server but occurs even if the usage message is locally defined. It is slow even if other evaluations have previously occurred. I'm working on Windows 7 and Mathematica 10.3.1.0. I tried to get help from Wolfram support (with Premier service) but it was not resolved and they have not responded further. Has anyone else observed this delay?
This may be a minor complaint but it is another example of things that work smoothly in one version becoming degraded in succeeding versions.