In this Ableton Live tutorial, a quick but easily overlooked freeze behavior is demonstrated: tracks using sidechain compression can be frozen without losing the ducking effect. When you freeze a track that includes a compressor triggered by a sidechain source like a kick drum, Live captures the sidechained behavior in its current state.
The frozen audio reflects the ducking exactly as it sounded before freezing, which you can confirm simply by listening. This makes freezing a reliable CPU-saving option even for more complex signal chains.