Bank the work
Bank work whenever you can. Waiting for someone to come back to you? Get something for the next step done. Have something fall through? Use the time to get ahead on the work you have or even might have. Push forward and bank the work, even if you don’t need it yet.
I think the trick to really getting things done and delivering is not about keeping up. It’s not about measuring everything to hit that deadline. It is getting well ahead of it. You see, something is going to get delayed or some problem will crop up somewhere. It could be really small but it will happen. If you’re on track for hitting that deadline and then a problem or delay arises, you’re no longer on track.
So any chance you get, push forward. Get ahead.
Will this ever cause problems in itself? It can come with a risk. Let’s say you have delivered a script or submitted a scene of animation and you’re waiting for feedback. If you get stuck into script 2 or that next scene, there is a possibility that the notes from the first one will change how you should have approached the next phase. But you have already begun to work through ideas and problems so, even if you have to make considerable changes based on that feedback, you still have a head start.
Keep going. Push ahead. Bank the work for when you need it. Your future self will thank you for it.