We have come to the last section regarding high performance for the web and how we can easily assess whether our application is performing at peak efficiency. However, there are times when we are going to want to actually do true benchmarking, even if this may not give the best picture. jsPerf is one of these tools.
Now, great care has to be taken when creating a jsPerf test. First, we can run into optimizations that the browser does and that may skew results in favor of one implementation versus another. Next, we have to make sure that we run these tests in multiple browsers. As explained in a previous section, every browser runs a different JavaScript engine and this means that the creators have implemented them all differently. Finally, we need to make sure that we do not have any extraneous code in our tests, otherwise, the results can be skewed.
Let...