In a new entry on his blog today, Marco Tabini introduces us to 5 PHP Performance Tips that we "probably don't want to hear".

I thought it might be interesting to write an article about the performance-enhancing tips you probably don't want to hear about - that is, those that are most likely to produce measurable (and durable) results but do require some effort on your part.

His list consists of:

• You Don't Need To Plan Ahead In Order To Have A Plan
• Combat Database Abuse
• Do You Really Need A Database Anyway?
• Scale Horizontally
• Refactor To Scale Vertically

For each, he explains the title and gives a bit of validation to the point. There's some great mentions of tools that you can use to help accomplish them too - a profiler, the Lucene and Xapian full-text databases, and Lustre.