Does changing the clipless pedal float change the speed of disengaging? A couple of weeks ago I had a crash that resulted in a broken ankle and quite a bit of soft tissue damage.  I hit a large, immovable object.  I was clipped in at the time of the crash with Shimano SPD-SL yellow (6-degree float).  There was very little time between the realization of an imminent crash and the impact to disengage.
I'm far enough along in my recovery to begin planning to resume riding.
Would switching to Shimano SPD-SL red (0-degree float) decrease the amount of time required to unclip?
The answer to Clipless Pedals - Float doesn't address the speed of twisting to disenage.
Although it would make unclipping faster, there are a few other things you can tweak to get the same effect without changing cleats.

Maybe you need to reduce your clip tension so it takes less force to unclip.
Practice the instinctive clip-in/out. You really don't want to have to consciously think about &quot;I need to unclip NOW&quot;. Rotating your feet outwards needs to be subconsciously linked to your &quot;danger is imminent&quot; response. Riding MTB with clip pedals is a good way to learn this habit.

Changing to a more restrictive cleat will require you to be much more precise with your cleat setup as the comment says, for fear of knee injury or even worse, reduced power. You might also not like the lack of float compared to the yellow cleats. On the contrary, you may realize you actually prefer less float, making it overall a win-win situation.