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- Apr 11, 2015
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To be more accurate, this 'optimizing apps' is actually to recreate the Dalvik cache (you can google it to find out more).
Hence, it occurs on boot up whenever the Dalvik cache is wiped (and thus there is need to recreate this cache)
Obviously, the Dalvik cache is wiped when updating (hence the 'optimizing apps' that you have experienced).
There are other ways in which the Dalvik cache may be wiped (i.e running recovery scripts/wiping through recovery,etc.)
This may sound foreign to you, but that's just how Android works.
In your case, you probably unwittingly wiped the Dalvik cache somehow.
so it is due to cache clearing prior to uninstalling the apps?