From a glance of the source it doesn't look like PourOver is doing any heavy lifting with Underscore. PourOver works lodash.underscore build of Lo-Dash without

From a glance of the source it doesn't look like PourOver is doing any heavy lifting with Underscore. PourOver works lodash.underscore build of Lo-Dash without issue though because it's not doing any heavy lifting you probably won't see a perf difference.