>> Go through memory, find all the dead objects, and *then* defrag the 
>> whole lot in a single pass. Done.
> 
>   And how is that faster from simply freeing the dead objects? The original
> point was that GC is much faster than freeing each object individually.
> Moving the dead objects around in memory before freeing them isn't going
> to help.

Nooo... move the *live* objects around. Not the dead ones.

And typically you use some kind of algorithm which reduces the amount 
you need to do even that.

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