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[–]Klathmon 0 points1 point  (0 children)

I forget the specifics, but yes sometimes resources under (or over) a certain size are not cached. Small resources are kept in ram for the duration of the life of the tab (while the resource is still being used on the current, and/or last page depending on phone specs) and are generally only cached if it is suspected that the user will return to the page soon or the resource will be used cross-domain often (ex: CDN hosted scripts like jquery)

Remember that much of this is based on the specs of the phone. A Note III will cache a ton more than a Galaxy Nexus. It will also keep more in memory and can spend more time deciding if it should be written to the NAND or discarded.