Check the Dependencies and embedd property of clientlibs folder:
dependencies: This is a list of other client library categories on which this library folder depends. For example, given two cq:ClientLibraryFolder nodes F and G, if a file in F requires another file in G in order to function properly, then at least one of the categories of G should be among the dependencies of F.
embed: Used to embed code from other libraries. If node F embeds nodes G and H, the resulting HTML will be a concentration of content from nodes G and H.
Any categories mentioned in the dependencies will trigger an extra call to other clientlibs