Why does my pasting (CTRL+V) stop working?

I am using a fairly large file and when I’m copy and pasting something, when I pasting something too fast, so for example I want to create multiple copies and hit CTRL + V 3 times in quick succession, the paste stops working and I have the ‘Pasting…’ label at the bottom of my screen permanently until I close and open the app again. I’m presuming this is due to the size of the file but it’s very frustrating and happens very frequently. Pasting via other means such as the right click options work but this isn’t ideal in certain circumstances.