Ashley
I agree that the potential for collision cells optimization could turn Construct 2 into the most powerful coding engine around, and I agree that it is quite worth optimizing, and I would submit that providing an on/off toggle would greatly accelerate your development towards that end. In fact, the benefits for you, us, and the entire Construct 2 engine itself would be worth providing it alone...You see, as users experiment with turning the switch on and off, they would soon realize not only how collision cells are better, but if there ever were a rare circumstance that turning them on made it worse, then they would wonder why...they will then easily report it to you, they will figure out exactly what is causing the worse performance and it could then be fixed for the next build!!! I strongly believe that for the development of Construct 2's performance, it would majorly benefit you and the Construct 2 User-Base as a whole to place an on/off toggle so that the real problems will be rooted out, and so the real benefits may be seen first hand and so players will agreeably/without exception, stop asking for it here on the forums!!! :].
Please consider doing this as this will:
1. Root out all of the performance problems as comparisons take place,
2. Stop all Petitioning for it on all of these forums, and
3. Make C-2 better in every way as you have more tools and feedback to use to improve the Performance - making little adjustments here and there where needed!!! :].
You're the Best Ashley!!! :]
Let's make Construct 2 the Best Engine Around!!! :D.