javac keeps names as interned Name objects. javadoc uses Strings, and creates Strings from Names as needed, sometimes thousands of times per instance. These strings should be cached.

calls/instance of ClassDoc.name: 779
calls/instance of ClassDoc.qualifiedName: 144
calls/instance of PackageDoc.qualifiedName: 10366
calls/instance of PackageDoc.qualifiedName: 1256
calls/instance of PackageDoc.qualifiedName: 1326
calls/instance of PackageDoc.qualifiedName: 149
calls/instance of PackageDoc.qualifiedName: 185
calls/instance of PackageDoc.qualifiedName: 266
calls/instance of PackageDoc.qualifiedName: 309
calls/instance of PackageDoc.qualifiedName: 911