How to optimise iOS app launch time?

Other than this info:

Is there any other definitive list (as of UE4.12) that describes specific ways to reduce the packaged ipa size as much as possible?**

I am currently using PakBlacklist-Shipping.txt and have excluded unrquired plugins.
The current TappyChicken version downloaded from the AppStore today is 67MB
https://itunes.apple.com/gb/app/tappy-chicken/id821841075?mt=8

However, if I repackage the Tappy Chicken project with optimisations I can never get it below 94MB.

I have seen Michael Noland’s comment about optimising Tappy Chicken down to 28MB (which is probably no longer valid), nonetheless, I don’t know how this was achieved.:

Ok,
I found these links which helped:

If there was a PakBlacklist-Shipping.txt for TappyChicken that may help.
The file isn’t included with the TappyChicken project so it is hard to determine what else Shane Caudle / Michael Noland decided to exclude to achieve a 67MB size.