Added a new editor_docs setting to the build. Disabling it can help when quick iteration times are desired. Setting it to false saves about 4 seconds of compile time for me (in the current stripped slim build that I'm working on).

SConstruct

@@ -166,6 +166,7 @@ opts.Add(
         ("pointers", "handles", "tracked_handles"),
     )
 )
+opts.Add(BoolVariable("editor_docs", "Whether to add docs to an editor build or not. Disabling this can significantly reduce incremental compile times. Only relevant for editor builds!", True))
 
 # Thirdparty libraries
 opts.Add(BoolVariable("builtin_certs", "Use the built-in SSL certificates bundles", True))

editor/SCsub

@@ -46,23 +46,26 @@ if env["tools"]:
 
     # Core API documentation.
     docs = []
-    docs += Glob("#doc/classes/*.xml")
 
-    # Module API documentation.
-    module_dirs = []
-    for d in env.doc_class_path.values():
-        if d not in module_dirs:
-            module_dirs.append(d)
+    if env["editor_docs"]:
+        docs += Glob("#doc/classes/*.xml")
 
-    for d in module_dirs:
-        if not os.path.isabs(d):
-            docs += Glob("#" + d + "/*.xml")  # Built-in.
-        else:
-            docs += Glob(d + "/*.xml")  # Custom.
+        # Module API documentation.
+        module_dirs = []
+        for d in env.doc_class_path.values():
+            if d not in module_dirs:
+                module_dirs.append(d)
 
-    _make_doc_data_class_path(env.Dir("#editor/doc").abspath)
+        for d in module_dirs:
+            if not os.path.isabs(d):
+                docs += Glob("#" + d + "/*.xml")  # Built-in.
+            else:
+                docs += Glob(d + "/*.xml")  # Custom.
+
+        _make_doc_data_class_path(env.Dir("#editor/doc").abspath)
+
+        docs = sorted(docs)
 
-    docs = sorted(docs)
     env.Depends("#editor/doc_data_compressed.gen.h", docs)
     env.CommandNoCache("#editor/doc_data_compressed.gen.h", docs, run_in_subprocess(editor_builders.make_doc_header))