I'm not sure what I did, but panning and rotating in the world view (moving around) is now INCREDIBLY slow. 

Use to I could fly around easily panning, spinning the viewport. But I must have fat fingered something because now it's incredibly fine grained. Any idea what I might have done?

At 7:00, you said to extrude along the z-axis by using "e+gz", extrude, grab, and lock to the z-axis; was this meant to be "e+z" as in extrude and lock to the z-axis? What is  the difference?

We get Z-fighting when we extrude the pentagon(already having a face) at 3.58.. why Don't we get some similar issue if we are doing a similar thing at 4.42? What's the difference?

Hi, I am using the 2.8 Release Candidate version and when I scale or extrude in top ortho it extrudes/scales downward as well as outward, how can I fix this?

Using 2.79, since 2.80 crashes\fails startup, I used ctrl-J to combine all the objects into one for easier animating. but when I went into top ortho view to work on the launch pad lo-and-behold my fins are 2D again
!(thank goodness for saving multiple files so I still have a good copy) Do I need to apply the modifier on the fins before using ctrl-J? Or, Can I just parent all the rocket parts to the main body of the rocket, cause wont that cause the other parts to move with the main body too when animating?

This wasn't a problem for me in 2.79, but 2.8 is proving an enigma.  I can create the first landing pad pentagon and scale it.  I can select/deselect the pentagon.  But nothing I do seems to extrude the pentagon.  I tried edit mode and E but it doesn't work.  I tried numerous other commands, none of which work.  Here's my screen:

version 2.8; how to change the circle from 32 points to 5.

I know how to do this in 2.79 but I can't find the settings for the circle in 2.8