webman的接口，请求耗时浮动非常大

public function index()
    {
        $data = [];
        $startTime = microtime(true);
        $data[] = $startTime;
        Redis::set('aa', 3333);
        $data[] = microtime(true);
        Redis::get('aa');
        $data[] = microtime(true);
        return json($data);
    }

[
    1708932845.55133,
    1708932847.131441,
    1708932847.137989
]