objective c - Cocoa @sum array operator too slow - alternatives? -

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i've got text field value bound key path uses @sum. when array controller filtered, text field updates properly, extremely slowly, lagging ui or outright beachballing after every key press (less number of items in arrangedobjects decreases). there no lag if don't use @sum; i've narrowed down this.

is there faster way same thing?

this should have answer:

http://cliffhacks.blogspot.com/2007/03/cocoa-bindings-sum-is-on-even-if-youre.html


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