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What are the meaning of the dexOptions.incremental, etc. Any body can explain them to me.
dex options android { dexOptions { incremental false preDexLibraries = false jumboMode = false javaMaxHeapSize "2048M" } } This affects all tasks using dex. 
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So dexoptions is a gradle object where some options to configure this java-code-to-android-bytecode transformation are defined. The options configured via this object are : targetAPILevel. force-jumbo mode (when enabled it allows a larger number of strings in the dex files)
its the maximum Ram that gradle can use while creating the build(apk file).
preDexLibraries (the answer of your third Q): it builds dex file out of libraries so it can be used in incremental builds (not building dex files every time for libraries). so using this item when clean build makes everything a little slower.
boolean incrementalWhether to enable the incremental mode for dx. This has many limitations and may not work. Use carefully.
String javaMaxHeapSizeSets the -JXmx* value when calling dx. Format should follow the 1024M pattern.
boolean jumboModeEnable jumbo mode in dx (--force-jumbo).
boolean preDexLibrariesWhether to pre-dex libraries. This can improve incremental builds, but clean builds may be slower.
These can be found here:
http://google.github.io/android-gradle-dsl/current/com.android.build.gradle.internal.dsl.DexOptions.html
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set incremental to true.
This is experimental feature that is disabled by default. However you can enable it. I personally didn't noticed any changes in term of speed (if it affect the speed).
More explanation can be found there https://stackoverflow.com/a/24224385/513413.
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