Info: Effect of free memory on displaying speed of large images (WPF, v19)

The attached WPF project uses version 19 of LEADTOOLS to create and display a huge image.
The image dimensions are 8,000 x 8,000 pixels, which means at 32 bits per pixel it requires approximately one quarter GB of RAM.

Testing on a computer with 4GB of RAM, executing the "Show image" command took approximately 1.5 seconds when most of the memory was free. However, when loading and running numerous applications that used up most of the computer's memory, the same command took more than 19 seconds.
When the extra applications were closed and their memory freed, the image creation and display became fast again without rebooting the computer.

A plausible explanation is that when Windows cannot allocate a sufficiently large contiguous block of memory to hold the entire image, virtual memory is employed and swapping to disk takes place. This can greatly affect performance during memory-intensive operations, and is neither a limitation of LEADTOOLS nor of WPF itself.