Originally Posted by afazel
I believe it pre-compiles similar to Dalvik, but more in advance. I know apps use more space in ART vs Dalvik.
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It is true that storage usage increases when ART is enabled, but it doesn't mean ART uses more space than dalvik. It's a misconception from people. What happens is that when you turn on ART, the folders "cache/dalvik-cache & data/dalvik-cache" stay untouched taking a huge space. Use a file explorer and confirm.
If you wipe those 2 folders, you might gain even more space back than what you had using dalvik.