Android system performance optimization (51) --- APK installation time is long

Aspects that can be optimized:
1. Change the mode of APK install to speed: android N uses JIT, and dex2oat compile is used in the execution phase, so the log will see that JIT-related thread running takes up a lot of CPU.
After modification, the APK installation phase will be Compile, so the installation time will become, some APKs use whitelist, forced to use interpret only, JIT mode, 
2. Adjustment: Aggressive LMK policy, in the case of too many background processes and services, after adjustment, you can change the Actively recycle some unimportant processes, ease system loading, and memory
3, adjust pefservice, and extend app launch CPU, Vcore and other boost time,

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