True, my old galaxy note 4 with 3GB is struggling for multitasking. Regular apps (like socials, offices) now takes at least 200MB per app. Yet the old SD8xx still could handle tasks fluently, but for now SD6xx has on par performance as old Sd8xx, though sd6xx has lower power consumption which really helps in battery life. So for me, minimum requirement for light and a bit moderate uses is 3GB with SD6xx.