Let's consider the following scenario:
var abs = Math.abs;
Wouldn't abs(-10) be quicker than Math.abs(-10)? Since abs is called directly.
This caught my attention: Math.abs vs custom abs function
Update:
The same test conducted in Internet Explorer 11 yields a completely different outcome:
I believe this could be attributed to optimizations on Chrome's V8 Engine for built-in functions.
A test by nnnnnn that illustrates my point: Property shortcut
Givi made this answer irrelevant. Please see the comments for clarification.
It appears that searching for a user-defined function within a user-defined object is slower compared to searching for a function bound to a local variable, which aligns with your initial assumption.
Interestingly, accessing Math.* functions seems to be quicker, possibly due to internal optimizations within the V8 engine. This means that storing built-in functions in a local variable (i.e., "caching") may actually result in slower performance, while caching user-defined functions can lead to faster execution.
For further insights and proof of concept, you can refer to this JavaScript performance test, showcasing the speed discrepancies between Math.* functions and their equivalent var x = Math.x versions.
In addition, I came across a line in your question suggesting optimization of built-in functions in Chrome's V8 Engine:
I'd speculate that this is due to some optimizations on built-in functions in Chrome's V8 Engine.
While I cannot confirm it with absolute certainty, there does seem to be evidence supporting this theory.
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