We ended up doing some testing on Test Flight and App Store (publishing the same app with statically linked frameworks and then dynamically linked ones). Our measures have shown dynamic frameworks to have the following impact on latency: 40–50ms/framework on iPhone 7 Plus and 80–90ms/framework on iPod Touch 5th Gen. Additionally, we found there was not much difference between Test Flight and App Store, meaning that Test Flight can be a good indication of the actual startup latency.

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