Great information, Ikai. I really feel that "instances" should be completely avoided in concept and language on the GAE. What if the feature was simply an enable/disable deal called "Warm Scale". If it were enabled, then your *next* instance would always be warm, regardless of how many instances you already had. This would be most noticeable and suitable for low QPS production apps that are constantly going from 0 to 1 instances (as you mentioned), but it could still be important for others, say, for a super-high-profile site, or a situation where your QPS is right at the threshold of instances and oscillating back and forth between two instances. Whatever the situation, if the solution were generalized like that, and most importantly not tied to a SPECIFIC NUMBER of instances, it would be up to the user to decide how important it was for them and whether to enable it.
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