How to decrease build times / speed up compile time in Xcode?

Question

What strategies can be used in general to decrease build times for any Xcode project? I\'m mostly interested in Xcode specific strategies.

I\'m doi

Answer 1

Quick Note Regarding 'Throw more hardware at it' approach..

SUMMARY: I experienced a SMALL speed increase from making a SIGNIFICANT hardware upgrade

Test: Build/Run the exact same project on cloned macbooks (where the only difference should be their hardware)

Old Macbook Air (1.86GHZ Core 2 Duo ONLY 2GB RAM) vs Brand New Macbook Pro (2.3GHZ Core i7 8GB RAM)

BUILDING ON IPHONE 3GS
Macbook Air 1:00 - 1:15
Macbook Pro ~1:00

=> 0 to 0:15 of speed increase

BUILDING ON IPHONE 4S
Macbook Pro ~0:35
Macbook Air ~0:50

=> ~15 seconds of speed increase

**Partially tested: There DOES apear to a significant difference between build times for the SIMULATOR between the 2 machines

In my continued experience.. you WILL get a significant increase when making big changes in PHONE hardware (i.e. build time on a 3GS vs iphone 5 (or 4 for that matter)).. at least in my experience, the limiting factor was the phone hardware (not the computer hardware).

SO.. to get the fastest build time..
option1) write code and run in the simulater on a fast computer OR
option 2) build on the device with the lastest iphone