perf: ~33% faster Desk response

- hardcode `/app` resolution
- use cached website settings everywhere. It was mixing cache and DB
  everywhere and re-quering same thing (why ?)

frappe/website/doctype/website_settings/website_settings.py

@@ -103,12 +103,12 @@ class WebsiteSettings(Document):
 def get_website_settings(context=None):
 	hooks = frappe.get_hooks()
 	context = frappe._dict(context or {})
-	settings: "WebsiteSettings" = frappe.get_single("Website Settings")
+	settings: "WebsiteSettings" = frappe.get_cached_doc("Website Settings")
 
 	context = context.update(
 		{
-			"top_bar_items": get_items("top_bar_items"),
-			"footer_items": get_items("footer_items"),
+			"top_bar_items": modify_header_footer_items(settings.top_bar_items),
+			"footer_items": modify_header_footer_items(settings.footer_items),
 			"post_login": [
 				{"label": _("My Account"), "url": "/me"},
 				{"label": _("Log out"), "url": "/?cmd=web_logout"},
@@ -203,22 +203,24 @@ def get_items(parentfield: str) -> list[dict]:
 		order_by="idx asc",
 		fields="*",
 	)
-	top_items = _items.copy()
+	return modify_header_footer_items(_items)
 
+
+def modify_header_footer_items(items: list):
+	top_items = items.copy()
 	# attach child items to top bar
-	for item in _items:
-		if not item["parent_label"]:
+	for item in items:
+		if not item.parent_label:
 			continue
 
 		for top_bar_item in top_items:
-			if top_bar_item["label"] != item["parent_label"]:
+			if top_bar_item.label != item.parent_label:
 				continue
 
-			if "child_items" not in top_bar_item:
+			if not top_bar_item.get("child_items"):
 				top_bar_item["child_items"] = []
 
-			top_bar_item["child_items"].append(item)
-
+			top_bar_item.child_items.append(item)
 			break
 
 	return top_items

frappe/website/doctype/website_theme/website_theme.py

@@ -133,9 +133,9 @@ class WebsiteTheme(Document):
 
 
 def get_active_theme() -> Optional["WebsiteTheme"]:
-	if website_theme := frappe.db.get_single_value("Website Settings", "website_theme"):
+	if website_theme := frappe.get_website_settings("website_theme"):
 		try:
-			return frappe.get_doc("Website Theme", website_theme)
+			return frappe.get_cached_doc("Website Theme", website_theme)
 		except frappe.DoesNotExistError:
 			pass
 

frappe/website/page_renderers/static_page.py

@@ -12,6 +12,8 @@ UNSUPPORTED_STATIC_PAGE_TYPES = ("html", "md", "js", "xml", "css", "txt", "py",
 
 
 class StaticPage(BaseRenderer):
+	__slots__ = ("path", "file_path")
+
 	def __init__(self, path, http_status_code=None):
 		super().__init__(path=path, http_status_code=http_status_code)
 		self.set_file_path()

frappe/website/path_resolver.py

@@ -17,6 +17,8 @@ from frappe.website.utils import can_cache, get_home_page
 
 
 class PathResolver:
+	__slots__ = ("path",)
+
 	def __init__(self, path):
 		self.path = path.strip("/ ")
 
@@ -36,6 +38,11 @@ class PathResolver:
 			return frappe.flags.redirect_location, RedirectPage(self.path)
 
 		endpoint = resolve_path(self.path)
+
+		# WARN: Hardcoded for better performance
+		if endpoint == "app":
+			return endpoint, TemplatePage(endpoint, 200)
+
 		custom_renderers = self.get_custom_page_renderers()
 		renderers = custom_renderers + [
 			StaticPage,