Codecov Report

Merging #2579 into develop will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    MDAnalysis/mdanalysis#2579      +/-   ##
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- Coverage    90.45%   90.43%   -0.02%     
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  Files          173      173              
  Lines        23381    23399      +18     
  Branches      3038     3037       -1     
===========================================
+ Hits         21149    21162      +13     
- Misses        1605     1609       +4     
- Partials       627      628       +1     

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These functions are hardly the bottleneck in encore, but every bit helps.

Original:

New:

merge_universes is strictly slower when the inputs are the same, but when select does not choose all the atoms, performance improves. This has the added benefit of being able to pass in universes with different atoms, so long as the selection is the same.

Closed due to being superceded by newer work (related to #2664).