What is "render query result" in the CPU render thread?

Hi, I’ve been testing the stat unit command using simple scenes. I found that my CPU draw or render thread time is always identical to the GPU time.

So I profiled the CPU and found a process called “render query result” takes about 5ms out of the total 8ms under the render thread. By lowering the resolution to 800x600 from 1920x1080, this process often dropped to 1ms. And in an empty scene, this process takes 3ms.

So under a high resolution setting, it seems that my GPU is bound by this “render query result” from the render thread? Anyone knows what it does and how to optimize it? Thanks.

Anyone happens to know this?