> var $clone = $el.clone().addClass('preload')
>         .css({ backgroundImage: 'url('+curImg+')' })
>         .insertAfter( $el );

> $el was subsequently remove()d, the remaining object put through a
> custom discard function (one attempt at a fix) and then nulled.

OK, here's my guess. Since the .clone() does a pushStack and selects
the clones, there's a reference to $el hiding in the $clone.prevObject
property so it won't be garbage-collected even if $el is nulled later.
Is $el complex? From the replacement code it sounds like it was not
much more than <div class="bg" /> and that shouldn't be 12MB.


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