Sensor data is not updating at a desired rate

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I am creating a rotational 16 beam Lidar using gpuraysensor. I am controlling the rotational speed by using a ModelPlugin. In one complete rotation I wanted 2048 different position of joint. I loaded my sensor and joint in the Load function. Joint control and getting sensor data is done in onUpdate() function which is called from the Load function using this->updateConnection = event::Events::ConnectWorldUpdateBegin(std::bind(&myjoint::onUpdate, this));

I tracked the joint angle using joint->Position() and apply appropriate force such that I can achieve that. For each joint position, I also need the raysensor data. _mygpuraysensor->Ranges(vector_of_range); However, I am getting the same range value for multiple joint position. Does this mean that my sensor is not updating fast enough? I even increase the update rate in sdf file to very high value but it didn't make any difference. Is there any way to achieve this?