Hey Jeff, It will be closer to 45, though right now it is less than that and fixed; this is due to a staged rollout of the feature. The concurrent request limit for Backends is dynamic, and App Engine will continue to push requests to an instance as long as cpu usage is below the instance class limit. This is how things will work for frontends as well, so as long as you're I/O bound, you will be able to serve a very large number of requests in parallel.
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