Well I haven't ran that exact build, but I've had 3.8.(something something) and currently run 4.02.49 (Platform 1.8.0.142) - I haven't noticed a speed difference in the two.
Would I upgrade? Yeah... just becuase I like using the new stuff. Is it needed? No, are you going to notice a drastic speed difference? Nope. It's the hardware itself limiting it; it's not like any of the systems were known to have huge memory leaks or software loops. - The Blackberrys simply don't come with real quick CPU's.
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