We'll need to identify the repetitive function calls to cache the results; that will speed up the code performance.

var a = Math.sqrt(10);
var b = Math.sqrt(10);

Here, in this case, we repeatedly calculate the same sqrt(10) and store it in different variables. This is overkill; as you know, it could be written as follows:

var sqrt_10 = Math.sqrt(10);
var a = sqrt_10, b = sqrt_10;

Similarly, especially in the world of selector-based frameworks, it's advisable to cache or buffer the selector objects. For example, consider the following HTML markup:

<a href="#" id="trigger">Trigger</a>
<div id="container">
Container
</div>

Here's the jQuery code that hides the container initially; when the trigger link is clicked...