New answers tagged performance
I guess you are using stock Samsung firmware. If so, probably you enabled Samsung's "power saving mode". Go to "power saving mode" settings and unchecked "CPU power saving" options.
Same reason a PC becomes slow over time. A lot of crap ends up on the system. For instance; even when you uninstall apps many of them many times leave something behind. The internal android DB becomes full and becomes harder to search because of the large amount of data.
I tried all the standard cache cleaning and uninstalling updates which helped a lot. I tried storage analyser but that didn't help the internal storage. Wasn't keen on rooting the phone. Then I came across Clean Master and used it on my wife's Samsung Ace which is notoriously short on internal memory and no option to move most apps to the SD card. So far so ...
It's a known issue with the Applocker app: http://code.google.com/p/applocker/issues/detail?id=8 It creates too many Linux processes, causing devices to slow way down due to lack of memory.
You shouldn't worry about ART or Dalvik since you have no control over which one they are using. Assume they are using the slower one and go from there. ART is far off anyway and even after its out as the default for android it will still probably be years before its the biggest chunk of the market. And ART is still in beta so who knows how good or bad it ...
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