[Closed] Catching Change Notifications

no… there is no such callbacks.
i suggest you to look at node event callbacks. run the code below and check that all your looking for events are handled:

global processCallbacks
global callbackContainer = if callbackContainer != undefined do
(
   callbackContainer.enabled = off
   undefined
)
callbacks.removescripts id:#some_id
deleteAllChangeHandlers id:#some_id
gc light:on
   
(
   fn processCallbacks event handles nodes: = 
   (
      if nodes == unsupplied do nodes = for handle in handles where isvalidnode (node = GetAnimByHandle handle) collect node
      
      format "> % %
" event handles
      case event of
      (
         #callbackBegin: ()
         #controllerStructured:
         (
         )
         #selectionChanged:
         (
            format "node select event: %
" nodes
         )
         #selectionSetChanged:
         (
            format "general select event: %
" nodes
         )
         #whenSelect:
         (
            format "when select event: %
" nodes
         )
         #callbackEnd: ()
         default: ()
      )
   )
   ::processCallbacks = processCallbacks
   
   ::callbackContainer = NodeEventCallback all:processCallbacks --mouseUp:on 
   --callbacks.addscript #selectionSetChanged "processCallbacks #selectionSetChanged #() nodes:(selection as array)" id:#some_id
   --when select objects change id:#some_id node do processCallbacks #whenSelect #() nodes:#(node)
)

you say slow… what is actually slow?