It takes a long time to INSERT FRAMES or DELETE FRAMES from the project on the timeline.
Even on a modest project, with my respectable computer, it takes MINUTES to insert a few seconds worth of empty frames into the project.
I usually take care to not split any audio or video assets. I just insert frames between actions so I can add something else into the middle of my scene.
I could almost do it faster by hand sometimes.
I am sure if someone takes the time to look into the algorithm used to do this, they'll have a "face palm" moment where they find a loop was nested very inefficiently or something like that.
The only good thing is it has worked reliably. But after 5 minutes you start to wonder.
iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD