More like graphics performance, not RAM. The iPhone 6 performed better than the 6 Plus and that was because the GPU had an easier time with the iPhone 6's lower resolution.Ram is an important consideration for
Longevity and updates . Take the iPhone 6 Plus for example. It had 1 GB of Ram and was riddled slower than it should have been due to the Ram. When the iPhone 6s launched, the additional ram made a significant difference with refreshes and multitasking.
Frequent Safari and app reloads, now those are due to lack of RAM. More RAM would have reduced reloading and crashes. It wouldn't have made much of a difference in terms of speed unless it was also going from single channel 1GB to dual channel 2GB (1x2GB).

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