The list below identifies modules that load other modules dynamically at 
runtime. 

See "Conditionally requiring modules" section here:
http://dojotoolkit.org/documentation/tutorials/1.9/modules_advanced/

dojo/fx
  dojo/fx/Toggler (applicable to legacy builds only)

esri/_coremap
  esri/SnappingManager

esri/map
  esri/dijit/Attribution
  dijit/form/HorizontalSlider
  dijit/form/VerticalSlider
  dijit/form/HorizontalRule
  dijit/form/VerticalRule
  dijit/form/HorizontalRuleLabels
  dijit/form/VerticalRuleLabels

esri/PopupManager
  esri/layers/FeatureLayer

esri/request
  esri/workers/RequestClient

esri/arcgis/utils
  esri/layers/LabelLayer

esri/dijit/Form
  dijit/form/TextBox
  dijit/form/DateTextBox
  dijit/form/NumberTextBox
  dijit/form/Select

esri/dijit/PopupRenderer
  dojox/charting/Chart2D
  dojox/charting/action2d/Tooltip
  esri/dijit/Rainbow
  dojox/charting/themes/*.*

esri/dijit/SymbolEditor
  esri/dijit/FontAlignment
  dijit/ColorPalette

esri/dijit/analysis/AnalysisBase
  esri/arcgis/Portal

esri/dijit/geoenrichment/Infographic
  esri/dijit/geoenrichment/OneVar
  esri/dijit/geoenrichment/RelatedVariables
  esri/dijit/geoenrichment/AgePyramid
  esri/dijit/geoenrichment/Tapestry

esri/dijit/geoenrichment/theme
  esri/dijit/geoenrichment/themes/*.*

esri/layers/FeatureLayer
  esri/plugins/spatialIndex

esri/tasks/GenerateRendererTask
  esri/tasks/generateRenderer

esri/toolbars/edit
  esri/dijit/SymbolEditor