Samsung sources components for the Galaxy S7 phones from several places - Samsung hardware Exynos chipset and outside Qualcomm Snapdragon chipset.From our tests we've seen that the Snapdragon 820 has an advantage in single-core CPU tests and GPU benchmarks, while the Exynos 8890 leads in multi-core tests. Galaxy S7 Exynos that looks how quickly apps are loaded from storage. There the Exynos has a slight lead, perhaps the multi-core advantage gives it a boost.
The Galaxy S7 Snapdragon chipset keep apps into RAM so the user can switch between them without having to reload the app completely and it sort of has - the Exynos-based Galaxy S7 flips back to apps very quickly while the Snapdragon variant reloads them from scratch.Both have the same amount of RAM - 4GB - so it's a difference in caching strategy.