That is hardly normal...

I would understand it would do it once to parse all the media when it mounts the memories (I assume it does it on the background on every boot) but it cannot have such a tool on the performance of the device to the point it sluggs everything out, UI included...

I guess that the method to lookup these mounts has to be different or less agressive...

---edit---

...and I see you missed my point. The device had been up whole day. It was not the indexing after mounting. It was the exact opposite. Sluggish and when those were unmounted from the phone it became VERY fast (dare I say "iPhone fast"...)