QB64 can make 4K windows. The code is simple. It is just squares and circles looped over and over. QB64 can be downloaded at www.QB64.com

Depending on your screen resolution, you may want to change the limit to something faster or slower.

Camtasia 9 was used to capture the screen. Camtasia was having trouble with capturing the full screen with the _FULLSCREEN QB64 command. A window was made and the borders of that window were cropped. Camtasia was also having trouble keeping up with the animation. A RAM Disk, created with ImDisk, was made so Camtasia did not have to use the slow hard drive. If you have an SSD, Camtasia may be able to keep up with the animation.

Code Download
* All code is QB64 only. QBasic 1.1 will not work
4CircleCenter.bas
4CornerCircleSide.bas
4CornerSquareSide.bas
CircleGrowOffCenter.bas
CircleRefresh.bas
SquareCenterMoveAway.bas