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This removes the overhead of field copying.

iris.load() timings for a file containing 40 cubes (t: 22, z: 38:, y: 192, x: 155)

Code Time to perform iris.load()
upstream/master 6.2s (ignores vertical dimension; scaling by 38 gives 3m 48s)
pp-mo/lbc_levels 4m 12s
This PR 3m 19s

@rhattersley
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This doesn't work! It's no longer a deep copy.

@rhattersley rhattersley deleted the lbc_levels branch November 20, 2014 15:50
pp-mo pushed a commit that referenced this pull request Jan 28, 2015
Modify 'change_vector_basis' to use direction vectors; test against exac...
pp-mo pushed a commit that referenced this pull request Oct 18, 2017
* Translate text PP save rules to Python

* Update rule function names

* Plumb in changes

* Changes from running tests

* Final test-related changes

* Changes to get the tests passing; a review action

* License headers

* Reorganisation of pp lbproc_pairs feature. (#12)

* Move lbproc_map to avoid circular import

* Reorganisation of pp lbproc_pairs feature.

* Remove unneeded lines
pp-mo pushed a commit that referenced this pull request Jul 31, 2018
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