Removed unnecessary calls to _recompute_all_models() to speed up addi…

…ng roots (#11739)

* Removed unnecessary calls to _recompute_all_models() to speed up adding roots

* Corrected last commit so that general calls to add_root() still call recompute_all_models(), and that is only worked around in special situations.

* Wrapping calls to add_root() within push_all_models_freeze()

* Made last commit more elegant by getting rid of loop

Co-authored-by: Efrem Braun <efrem.braun@gmail.comm>

bokehjs/src/lib/document/document.ts

@@ -642,12 +642,14 @@ export class Document {
     Document._initialize_references_json(references_json, new Map(), references, new Map())
 
     const doc = new Document({resolver})
+    doc._push_all_models_freeze()
     for (const id of root_ids) {
       const root = references.get(id)
       if (root != null) {
         doc.add_root(root as Model) // XXX: HasProps
       }
     }
+    doc._pop_all_models_freeze()
     doc.set_title(json.title!) // XXX!
     return doc
   }