Optimum Settings to speed up Xcode indexing and compiling

So using Xcode 8.2.1

Noticing extremely slow indexing and then Building - compiling times.

What are some steps and trick I can implement to reduce these long times?

Starting in Unity, what Build Settings should I use for development(pre release)? I'm already enabling 'Symlink libraries'.

I googled an came across several links about Disable Dsym file, but don't think these apply to latest Unity 5.5.2.
http://answers.unity3d.com/questions/486660/xcode-unity-takes-ages-compiling.html

And then in Xcode, what are some things I might try as well to reduce these times?

 

I would like to know too, anyone?

 

The main problem is that Unity generate a LOT of code and so indexing takes a lot of time.
You can disable indexing.

The only way we reduced the time it takes to compile is to upgrade hardware. We switched from an iMac to the last MacBook Pro and its compiling 30% faster than before.

 

what is indexing even for?
I usually just press Build and it immediately starts building.