I am adapting a workflow from a Photoshop action and there is one step
that does haze removal with USM using radius 60, amount 0.30 and
threshold 1, that is extremely slow.  I just timed it on a 94.4MB 4048x3040
photograph and it took 3 minutes, 50 seconds.  I have a tile cache of
256MB and all other operations that I do are pretty fast.  Is it
expected that USM will be slow with such large radius settings or is
this a problem?  I'm using version 2.0.0 on Linux.  I need to get round
to compiling the latest version but don't know if that would affect this
particular issue.

Steve Crane
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