There's a lot of misinformation about web application performance. Learn what's worth worrying about and what isn't.
Myth: Single quotes are faster than double quotes
A persistent myth holds that the choice of single quotes is more performant than double quotes. This is nonsense.
Myth: Relational databases are too slow and don't scale
Relational databases are a good fit for most use cases, but there are some gotchas to be aware of when using them.
Myth: Using an ORM will slow your site down
You'll often hear misleading claims that using an ORM makes for slower database queries. This is actually due to naive usage.
Myth: Performance is a matter of choosing the right framework
Performance benchmarks may seem a useful guide when picking a framework to develop your application in, but they need to be taken with a pinch of salt.
Myth: PHP is slower than language X
There are languages where the runtime is faster than PHP. However, that's often irrelevant since the language runtime isn't usually a significant bottleneck.