Lack of RAM was the sole reason for me upgrading from iPad 1 to 2. The 256mb was too limiting, even with core IOS apps such as Safari where if you scrolled too fast you got the checker board effect as the rest of the web page was loaded into memory. This was mostly eradicated on the iPad 2 with twice the RAM. IOS works well with a small amount of RAM but if you then try to run an intensive app, the lack of RAM can become all too obvious.
I would've been more interested in updating for more RAM, but iOS 5.1 seems to have eliminated the many RAM-related crashes I was having on iPad 1 and 2.
I hadn't changed my iPad habits since iPad 1's debut, but iOS 5 sent things crashing often, and my diagnostics logs showed RAM-related crashes repeatedly, especially on iPad 1.
Since going to iOS 5.1, I've had only one crash, versus multiple crashes every day on iOS 5 and 5.0.1.
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