IPad free space fragmentation

I'm wondering how to defragment the free space on the iPad's solid state (i.e. NAND flash) drive? 
The reason I ask, is that I've found that the more I use my iPad 2, the slower it gets (even after a restart).  When my Ipad 2 had 1.5 GB of "disk" space free (out of 64 GB), I was getting lousy (1 MB/sec) performance for "disk" writes, tested using the free PerformanceTest benchmark app.  This is because of the way flash writes work (the whole block needs to be read and then written).  The lousy write speeds was cauing performance issues in some apps that did a lot of writing to "disk".  It also made syncing to my PC really slow.
I deleted a bunch of iTunes videos, which freed up about 11 GB of space.  My write speeds then shot up to 30 MB/sec, since all that space that was used for the videos was free (and contiguous).  At that point all my performance issues went away and syncing was very fast.  As I started using the iPad though (and doing disk writes), the write speeds started to slow down again.  Today I was down to 6 GB free and disk writes were around 6 MB/sec.  I deleted another video and now it's at 8 GB free, with writes at about 15 MB/sec.  That's still only about half the max write speed.
This seems like a design issue with the iPad since solid state drives are supposed to "garbage collect" in the background, moving free space into contiguous chunks for performance reasons.  iOS doesn't appear to be doing that at all.    There are programs that can do that for PCs and some OS do it automatically, but not for iOS.
Is there any way to consolidate the free space on an iPad, other than doing a complete restore?

You may want to take a peek the next time you replay to a thread. The new search feature brings up threads regardless of how old they are. This one is over two years old and it's a pretty sure bet that the OP has long since resolved their issue or moved onto a new device.

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    Trailer;
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