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It's obvious that PHP framework performance mainly depends on the lines of code that have to be executed for each request. While Symlex was designed to be simple and lean, a good performance is a very important by-product of this approach.


The best code is no code. Where there is no code, there are no bugs. No API to learn. No awkward UI. The best refactors are deletions.
Eric Elliott

As published by, REST requests are more than 40% faster compared to other common PHP frameworks:

Response times of popular PHP frameworks

Note that these response times were measured in fully optimized production mode on fast server hardware with only 5 concurrent requests. In practice, differences might be much larger in terms of absolute time. Memory consumption should be considered as well:

Memory footprint of popular PHP frameworks

Why should you care?

First, your users will love it. As a rule of thumb, 100 ms is about the limit for having them feel that the system is reacting instantaneously, meaning that no special feedback is necessary except to display the result. The total response time also includes network (~25 ms), browser and other overhead, which only leaves a small fraction of those 100 ms for implementing the actual business logic.

Second, you'll save a lot of money for server infrastructure and developers are more productive as tests are running faster.