JSON Performance
I have found that performance while using JSON.parse(foo) where foo is
{"movements":[["Thruster",21, 95],["Pullup",21, 0],["Thruster",15, 95],["Pullup",15, 0],["Thruster",9, 95],["Pullup",9, 0]]}
is horrible, it takes about 25sec on a Iphone 3G.
Has anyone ran into this issue? Any alternatives?
I definitely cant have a user wait 25 sec for this to happen.
5 Answers
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I happened to test a json parsing of a json file with 5000 objects in an array as a part of one of project's stress test…..and it took roughly 5000ms …(Though that was on Android).
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I don't have a JSON parser in my head, but that fragment doesn't look right. Maybe you should check you JSON string here: http://www.jsonlint.com/
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Yeah that's not valid JSON….note that your first array is missing it's starting [, the first use of "meters" is not enclosed in quotes, and you have an extra ] before the closing }. Also, while it doesn't effect JSON you probably are also missing an array entry from the first block as all the rest have 3.
{meters, 33],["feet",21, 0],["miles",15, 95],["miles",15, 0],["inches",9, 95],["kilometers",9, 0]]}
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How big is the json string?
I do parse strings and don't have this issue ( on a 3GS and ipod 2nd gen ). -
I update the JSON Object to the correct one and validated it. It says its is Valid, so I don't understand why it would take SO long to parse.
Any hints?