Performance question

From	"Joey@still_Learning.invalid" <Joey@still_Learning.invalid>
Newsgroups	comp.lang.javascript
Subject	Performance question
Date	2015-08-29 16:11 -0700
Message-ID	<dje4uadokf3hpfi2e702t404088avf2d49@4ax.com> (permalink)

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I'm attempting to optimize a lengthy ECMA script for speed. Please
pardon my ignorance...

I have multiple instances of document.getElementById('id').checked or
value. 

Q1: When running the script, does it search through a table for the
address, or does it only do it once during compilation?

Q2. Moot if Q1 answer is 'only once.' If I declare a global variable
as 'var xxx = document.getElementById('id'),' and use it throughout
the script as 'xxx.value or xxx.checked,' does this improve
performance?

Thanks in advance for helping and not beating me up. 
-- 
Joey

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Performance question "Joey@still_Learning.invalid" <Joey@still_Learning.invalid> - 2015-08-29 16:11 -0700
  Re: Performance question "Joey@still_Learning.invalid" <Joey@still_Learning.invalid> - 2015-08-30 09:50 -0700
  Re: Performance question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-08-30 22:16 +0200
    Re: Performance question Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-08-30 22:21 +0200

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