I'm new to Mathematica. I have Version 10.3.0 running under Windows 10, 64-bit.
If I open the 10.3.0 kernel and type 2 + 2 Shift Return I get an immediate answer.
If I open the main program and open an existing notebook and then type 2 + 2 Shift Return, there can be a noticeable delay of perhaps tens of seconds before the answer appears. I see a bolded square bracket on the far right of the line.
My computer is pretty fast with SSD disks and 8.00 GB RAM and I'm not used to seeing delays like this.
Is this a common phenomenon?
What could be going on behind the scenes in a notebook that takes so long?
Is there some simple action I can take to speed things up?