slight var loading optimization (#78835)

Avoid having to recalculate these values since they don't change from first access

changelogs/fragments/optimize_vars_loads.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - optimized var loading by caching results as there is no variance in input during run.

lib/ansible/utils/vars.py

@@ -181,6 +181,8 @@ def merge_hash(x, y, recursive=True, list_merge='replace'):
 
 
 def load_extra_vars(loader):
+
+    if not getattr(load_extra_vars, 'extra_vars', None):
         extra_vars = {}
         for extra_vars_opt in context.CLIARGS.get('extra_vars', tuple()):
             data = None
@@ -205,11 +207,14 @@ def load_extra_vars(loader):
             else:
                 raise AnsibleOptionsError("Invalid extra vars data supplied. '%s' could not be made into a dictionary" % extra_vars_opt)
 
-    return extra_vars
+        setattr(load_extra_vars, 'extra_vars', extra_vars)
+
+    return load_extra_vars.extra_vars
 
 
 def load_options_vars(version):
 
+    if not getattr(load_options_vars, 'options_vars', None):
         if version is None:
             version = 'Unknown'
         options_vars = {'ansible_version': version}
@@ -227,7 +232,9 @@ def load_options_vars(version):
             if opt is not None:
                 options_vars['ansible_%s' % alias] = opt
 
-    return options_vars
+        setattr(load_options_vars, 'options_vars', options_vars)
+
+    return load_options_vars.options_vars
 
 
 def _isidentifier_PY3(ident):