Owners of original Nexus 7's with sluggish performance should see a speed boost after the update
It seems that the curious case of the sluggish Nexus 7 has been solved with the inclusion of TRIM support in Android 4.3. TRIM is essentially a way for the device's software to communicate with the on-board storage to let it know when blocks are sitting unused and ready for garbage collection. This is a necessary process, because when a user "deletes" files on a device, the file isn't actually removed from storage but simply marked as being available space to be cleared later when it is needed by the system. Unless TRIM is working to actually clear up those unused blocks, they will still be considered full by the storage itself.
For previous versions of Android TRIM wasn't enabled, which led to slower and slower I/O performance over time -- something that hit the Nexus 7 particularly hard. Luckily thanks to some investigation and testing by AnandTech, it is confirmed that the Android 4.3 update is bringing TRIM support to not only the Nexus 7 but every Nexus device.
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Source: http://feedproxy.google.com/~r/androidcentral/~3/lISwH7x56nI/story01.htm
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