if you use Apache::Reload with a threaded MPM and multiple interpreters, the modules will be reloaded by each interpreter as they are used, not every interpreter all at once. similar to 1.x where each child has its own interpreter, the modules are reloaded as each kid is hit with a request.
note that if a module is loaded at startup, the syntax tree of each subroutine is shared between interpreters (big win), but each subroutine has its own padlist (where lexical my variables are stored). once Apache::Reload reloads a module, this sharing goes away and each interpreter will have its own copy of the syntax tree for the given subroutines.
