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I'm very interested what differences microptimizations (like using while(list() = each()) instead of foreach) make when scaling.

Also, I noticed that when I clicked the return to website after clicking on the subscribe button your website, it went to google.com instead, and when I clicked continue to our website button after clicking the email confirmation link, it went to http://www.phpscalingbook.com/ (404 error).

And if you need any proofreaders, I'd be more than happy to help!

On a typical LAMP web site the hottest bottlenecks are usually PHP is waiting for database I/O, it's not typical that slight code optimizations will produce a dramatic improvement.

I'd be interested in your opinion about premature optimizations and how your experiences with bottlenecks matched up compared to your initial expectations. I often find myself overthinking performance and scalability issues that turn out to be not relevant in the end...

Are you looking for any proofreaders?