我有一个简单的Java应用程序，它需要遍历一个大型JSON数组（包含约2万个项目），并且在每个数组中，我解析一个子数组。每个项目如下所示：

{"index":0,"f1":[2,16,16,16,16,16,32,16],"f2":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"startTime":0.0}

我正在JSONPath遍历每个项目。我要做的是首先读取长度，然后简单地遍历整个数组。但这非常慢（例如每秒1个项目）。

int length = JsonPath.read(response, "$.result.length()");
for (int i = 0; i < length; i++) {
    double start_time = JsonPath.read(response, "$.result["+i+"].startTime");
    ArrayList<Integer> f1= JsonPath.read(response, "$.result["+i+"].f1");
    //...other things
}

有没有优化的方法？