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Do browser vendors optimize against jQuery?
I know this sounds absurd anti-standard, but I can imagine browser vendor has optimization against jQuery code built into their JS compiler/interpreter.
For example, lets say the JS compiler/interpreter sees, $(‘.blah > p’), the browser can say, hmm, I see that user is trying to grab an element, instead of letting jQuery do all the browser detection, it could just take the [actual DOM object], and return $([actual DOM object]) right away.
No browser vendor announced such a feature at the moment.
It is possible, however. You can easily store for reference parsed Javascript (IL/bytecode, whatever you use in your engine) for most often used versions of jQuery inside JS engine and when incoming function matches that signature, replace it with native version.
I guess the only thing that you have to take in consideration is how much time you’d spend on implementing it vs. speed gains against modern JIT engines. Because some of them already compile code to some native form, at least partially, it is not quite clear if there will be any substantial gains or not.