Yes, you can change camera speed and change/replace elements. The only elements that were pre-rendered are chemicals elements, ink animation and the core of the bacteria.

Helo. Find the layer called “Blur” and turn it off. You can also use compound blur or fast blur plug-in instead of camera lens blur.

Unfortunately it still slowly. do you mean to remove the eye symbol from the layer that called blur from each scene?

Yes. Or you can disable camera lens blur plug-in from this layer and replace it to fast blur.

This is for camera lens blur plug-ins. Turn it off or use fast blur instead (which I not recommended)