What is JIT? el oh el (lol)
It stands for Just in Time for how it compiles code.
The JIT compiler is a trace-based compiler which detects hot code and then compiles that code as needed. Minimal heap use and no need for persistent storage are features which should help the adoption of JIT into mobile devices, where the performance boost of JIT compilation has to be balanced against the cost in battery life and memory
Glad you asked?
reference: Android's Dalvik to be JIT boosted - The H Open Source: News and Features
If you apply a rom or theme - backup first!
If you don't know how to backup...Stop until you do.
hint: I name my backups like this: sg6.0_20100428 or ss4.2_20100626 to easily find them later. rom and date.
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Christim is correct. For me it is like adding a booster to you phone that kick in when needed.
I think Chevy or Adamz have a JIT kernel on their site