No problem Mike 🙂
yeah, the red frame number was supposed to indicate that it can’t keep up. However, right now there’s a bug with it, so it will turn red at odd times – even when it is absolutely not struggling. 🙂 we’ll get it fixed soon.
Doing your animation scene for scene is normally the way to go. And then edit them together afterwards as you suggest. This is often a simpler way of working and also is less demanding on memory usage. However, it should be perfectly doable to have a few scenes together as one file – no problem. But why it is in your case is puzzling…
For now try the scene by scene approach. When Frederik (programmer) is back, we might be able to investigate this better.