"Array" Operation Performance
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Title
“Array” Operation Performance on All Browsers
Detailed write-up
Description
Array-related operations are expensive for all browsers. Comparing to other operations, the same browser takes considerable more time for array-related operations. The differences can be a few orders of magnitude some times. Specifically:
- for IE7: “pop”, “push”, “shift”, “join” etc are all very expensive that can take ten times or even a few hundred times longer to complete than other operations;
- For FireFox: “pop” and “push” operations perform fairly well in comparison to other operations (“pop” and “push” operations cost 160% of the base operation on FireFox. On IE, they cost 532% and 3523% of the base operation respectively). “shift” and “join” are very expensive. The operation “creating an empty array using ‘new Array()’ constructor” costs 662% of the base operation while this number is only 119% and 145% on IE and Safari. This is related to the issue that it is very expensive for FireFox to create new objects. Other browsers do not seem to have this problem.
- For Safari, “pop”, “shift” and “join” are expensive operations.
Why Is This Important?
"Array" operations are fundamental to Ajax applications and are frequently used in applications.
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