I haven't had a chance to merge it yet. I've been busy with issues targeted for the 3.7 release. Merging this will require some time as I need to ensure that it doesn't introduce any regressions (the last pull request was much smaller, and still a regression slipped through). I'll have more time to look into this after the 3.7 release is done and I'm done with the new GUI builder modifications. Before the 3.8 release.
From my perspective, the contents of the pull request don't present much up-side as for most apps there would be no performance increase and even with your apps, after we increased the heap size, it likely wouldn't affect performance much (correct me if I'm wrong). And the down-side is that it could introduce bugs that don't exist now. Therefore I feel a low urgency on this one. That "priority" can be changed if Shai or Chen disagree with my assessment - or if you can make a compelling case for it being more urgent.
Steve