I'm using standalone Inkcut in Ubuntu 20.04.1 LTS. My plotter is Roland PNC-1100. I didn't know what is going on with long pauses between moves and how to fix it, if possible. But i tried one very simple thing and it worked.
I just cut some stickers and plot was done without any pauses between moves.
What you need to do is let the progress bar get to 100% and then start the plot on your plotter. If you don't know about which progress bar i'm talking about, i added image. It is in "Live" tab.
Hope it helps.