Daniel Palme has now integrated Rezolver into his benchmarks as standard, he regularly updates this blog post with in depth comments and analysis on his latest results.
The current status of Rezolver's performance is 'Average', which is fair, because of the results of the Child Container tests, which we are working on improving.
Benchmarking an IOC container obviously has pitfalls. In a web environment, for example, it's highly unlikely you'll hit the kind of traffic levels required for your choice of container to have a noticeable impact on speed.
But, that said, speed is still important - especially with something as fundamental as an object which is taking control of how you create your objects! In any case, if you're reading this then you're a developer - which means you're probably interested in how fast Rezolver stacks up against your previous favourite container ;)
Over on GitHub Daniel Palme has, for a while now, been maintaining a benchmarking suite for IOC containers - called IOCPerformance. In addition to our own performance analysis, this program offers an easy way to stress test the Rezolver containers both on their own, but also against other popular containers.
The tests include singletons, transients, objects which require a mixture of these, complex objects which require lots of nested dependencies, resolving enumerables and child containers, and does provide a reasonably thorough examination of a container's features in addition to its performance.
Excluding Rezolver and the 'No' container, which the baseline, there are 31 containers now being stress-tested by this application, with the list growing.
Rezolver performs very well across the board, however it suffers in benchmarks which constantly destroy and recreate containers.
In particular, the performance in the 'Child Containers' benchmark is particularly poor - caused by the fact that there's an overhead on the first Resolve call to a container, as that's when it compiles the associated ICompiledTarget for that service.
Because of the way this benchmark is performed, it means that Rezolver spends most of its time dynamically compiling the same delegates.
A solution is in the pipeline for this, which will be implemented once we've implemented another compiler that's based entirely on reflection and late-bound delegates instead of dynamically constructed expression trees. When this is done and merged with the current expression-tree based compiler, the performance of child containers will improve drastically.
As the other benchmarks show, however, Rezolver's normal-use performance is up there with the best which, when coupled with its extensibility and featureset, should make it a decent contender for any new project.