Gets or sets the tile size (width/height) in pixels used when dividing the image into blocks.
The size (width\height) in pixels of the tiles that the image is divided.
Default tile size is 400x400. With larger images you need to choose a good tile size to avoid heavy server load that may causes a Bottleneck to you application. Minimum tile size is 256x256.
Refer to OpenImageUrl(string)