JavaScriptCore Objective-C Slow When accessing non-existent objects

Question

JavaScriptCore Objective-C Slow When accessing non-existent objects

My application slowed down a lot and I did some tests to find out why. I ran it twice, the first time I accessed an object that is in context, and the second access to a nonexistent object in JSContext I tracked it to this part:

JSContext *ctx = [[JSContext alloc] init];

[ctx evaluateScript:scpt];
// var someExisting = {"view": {"tint-color": "red"}};

NSDate * start = [NSDate date];

    for (int i=0; i<=100000; i++) {
    ctx[@"someExisting"][@"view"][@"tint-color"];
}

NSDate * end = [NSDate date];

    double timeTaken = [end timeIntervalSinceDate:start] * 1000;
    NSLog(@"%g", timeTaken);
[ctx release];

I got 195.697

JSContext *ctx = [[JSContext alloc] init];

[ctx evaluateScript:scpt];
// var someExisting = {"view": {"tint-color": "red"}};

NSDate * start = [NSDate date];

    for (int i=0; i<=100000; i++) {
    ctx[@"nonExisting"][@"view"][@"tint-color"];
}

NSDate * end = [NSDate date];

    double timeTaken = [end timeIntervalSinceDate:start] * 1000;
    NSLog(@"%g", timeTaken);
[ctx release];