Make use of test set on compute_perf optional; Update docs

12 jobs for opt_test in 5 minutes and 58 seconds (queued for 6 seconds)
Status Job ID Name Coverage
  Build
passed #27921
conda-linux
build_linux_27

00:03:10

passed #27923
conda-linux
build_linux_34

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passed #27925
conda-linux
build_linux_35

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passed #27926
conda-macosx
build_macosx_27

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passed #27924
conda-macosx
build_macosx_34

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passed #27922
conda-macosx
build_macosx_35

00:01:30

 
  Test
passed #27931
conda-linux
test_linux_27

00:02:43

90.0%
passed #27929
conda-linux
test_linux_34

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90.0%
passed #27927
conda-linux
test_linux_35

00:02:44

90.0%
passed #27928
conda-macosx
test_macosx_27

00:01:06

90.0%
passed #27930
conda-macosx
test_macosx_34

00:00:57

90.0%
passed #27932
conda-macosx
test_macosx_35

00:00:55

90.0%