[ENH] Add caching to connection for select methods

[ericzolf]

Is your feature request related to a problem? Please describe.

Certain answers will always be the same throughout the lifetime of a connection (e.g. the OS' name) so that caching these answers could make sense, and would spare a lot of time else spent on the communication between client and server.

Describe the solution you'd like

I still need to investigate this idea in more details, especially if it can be implemented in a generic manner. (perhaps with a decorator?)

Describe alternatives you've considered

Attach such information to Globals and/or spread through the client/server connection only once, and reuse it there.

Additional context

Idea came from #794