Just an FYI, the Unity Game Optimization eBook is free today (for the next 11 hours) on PACKT.
https://www.packtpub.com/free-learning
I have no affiliation with the site, I just check out the free books each day and wanted to share this one since it has to do with Unity.
To claim you’ll need to create an account (free) and the book can only be viewed within a browser (unless you pay for a subscription), but claiming it today will add it to your account so you can view it anytime in the future.