We are downloading multiple thumbnail images during gameplay using the DownloadImage node.
It works perfectly, except that we get performance hitches when the requests return and deliver.
On processing the request, the CPU stalls for ~9ms and I have no clue why this happens.
UAsyncTaskDownloadImage::HandleImageRequest creates a UTexture2DDynamic and a RenderCommand to put raw pixel data into the Texture. It seems totaly fine.
Any idea whats going on? What is the gamethread waiting for? Only thing that would come to my mind is that the GameThread itself get sceduled away from the Operating System to process another thread. Though we run 8 Core CPU and world is empty, no problems with total cpu usage.