What is your operating system?
Windows 11 latest version
What is your Shotcut version (see Help > About Shotcut)?
23.12.15
Can you repeat the problem? If so, what are the steps?
When using the Speed: Foward Only, the speed just randomly starts going down on the dial and my computer with a 6 core processor just slows to a halt at the footage starts lagging. I have no other apps open.