diff --git a/CODE_GUIDELINES.md b/CODE_GUIDELINES.md
index 70e1596..439eee8 100644
--- a/CODE_GUIDELINES.md
+++ b/CODE_GUIDELINES.md
@@ -1264,6 +1264,8 @@ end
 
 ### 3.12 Internationalization: Gettext
 
+**German (de):** Use informal address (“duzen”). All user-facing German text should address the user as “du” (e.g. “Bitte versuche es erneut”, “Deine Einstellungen”), not “Sie”.
+
 **Define Translations:**
 
 ```elixir
diff --git a/lib/mv_web/live/group_live/show.ex b/lib/mv_web/live/group_live/show.ex
index d9a5d98..dc0a922 100644
--- a/lib/mv_web/live/group_live/show.ex
+++ b/lib/mv_web/live/group_live/show.ex
@@ -17,10 +17,12 @@ defmodule MvWeb.GroupLive.Show do
 
   require Logger
 
+  import Ash.Expr
   import MvWeb.LiveHelpers, only: [current_actor: 1]
   import MvWeb.Authorization
 
   alias Mv.Membership
+  alias MvWeb.Helpers.MemberHelpers, as: MemberHelpers
 
   @impl true
   def mount(_params, _session, socket) do
@@ -29,6 +31,7 @@ defmodule MvWeb.GroupLive.Show do
      |> assign(:show_add_member_input, false)
      |> assign(:member_search_query, "")
      |> assign(:available_members, [])
+     |> assign(:add_member_candidates, [])
      |> assign(:selected_member_ids, [])
      |> assign(:selected_members, [])
      |> assign(:show_member_dropdown, false)
@@ -94,12 +97,12 @@ defmodule MvWeb.GroupLive.Show do
         </h1>
 
         <div class="flex gap-2">
-          <%= if can?(@current_user, :update, Mv.Membership.Group) do %>
+          <%= if can?(@current_user, :update, @group) do %>
             <.button variant="primary" navigate={~p"/groups/#{@group.slug}/edit"}>
               {gettext("Edit")}
             </.button>
           <% end %>
-          <%= if can?(@current_user, :destroy, Mv.Membership.Group) do %>
+          <%= if can?(@current_user, :destroy, @group) do %>
             <.button class="btn-error" phx-click="open_delete_modal">
               {gettext("Delete")}
             </.button>
@@ -132,7 +135,7 @@ defmodule MvWeb.GroupLive.Show do
               )}
             </p>
 
-            <%= if can?(@current_user, :update, Mv.Membership.Group) do %>
+            <%= if can?(@current_user, :update, @group) do %>
               <div class="mb-4">
                 <%= if assigns[:show_add_member_input] do %>
                   <div class="join w-full">
@@ -263,7 +266,7 @@ defmodule MvWeb.GroupLive.Show do
                     <tr>
                       <th>{gettext("Name")}</th>
                       <th>{gettext("Email")}</th>
-                      <%= if can?(@current_user, :update, Mv.Membership.Group) do %>
+                      <%= if can?(@current_user, :update, @group) do %>
                         <th class="w-0">{gettext("Actions")}</th>
                       <% end %>
                     </tr>
@@ -291,7 +294,7 @@ defmodule MvWeb.GroupLive.Show do
                             <span class="text-base-content/50 italic">—</span>
                           <% end %>
                         </td>
-                        <%= if can?(@current_user, :update, Mv.Membership.Group) do %>
+                        <%= if can?(@current_user, :update, @group) do %>
                           <td>
                             <button
                               type="button"
@@ -431,24 +434,31 @@ defmodule MvWeb.GroupLive.Show do
   # Add Member Events
   @impl true
   def handle_event("show_add_member_input", _params, socket) do
-    # Use existing @group from assigns; no DB read on focus. Reload only on commit (add/remove).
-    {:noreply,
-     socket
-     |> assign(:show_add_member_input, true)
-     |> assign(:member_search_query, "")
-     |> assign(:available_members, [])
-     |> assign(:selected_member_ids, [])
-     |> assign(:selected_members, [])
-     |> assign(:show_member_dropdown, false)
-     |> assign(:focused_member_index, nil)}
+    # Load candidate members once (single DB read). Search/focus then filter in memory (R2).
+    socket =
+      socket
+      |> assign(:show_add_member_input, true)
+      |> assign(:member_search_query, "")
+      |> assign(:selected_member_ids, [])
+      |> assign(:selected_members, [])
+      |> assign(:show_member_dropdown, false)
+      |> assign(:focused_member_index, nil)
+      |> load_add_member_candidates()
+
+    {:noreply, socket}
   end
 
   @impl true
   def handle_event("show_member_dropdown", _params, socket) do
-    # Use existing group.members for filtering; reload only on add/remove
+    # Filter in memory from preloaded candidates; no DB read (R2).
+    query = socket.assigns.member_search_query || ""
+
     socket =
       socket
-      |> load_available_members("")
+      |> assign(
+        :available_members,
+        filter_candidates_in_memory(socket.assigns.add_member_candidates, query)
+      )
       |> assign(:show_member_dropdown, true)
       |> assign(:focused_member_index, nil)
 
@@ -462,6 +472,7 @@ defmodule MvWeb.GroupLive.Show do
      |> assign(:show_add_member_input, false)
      |> assign(:member_search_query, "")
      |> assign(:available_members, [])
+     |> assign(:add_member_candidates, [])
      |> assign(:selected_member_ids, [])
      |> assign(:selected_members, [])
      |> assign(:show_member_dropdown, false)
@@ -528,11 +539,13 @@ defmodule MvWeb.GroupLive.Show do
 
   @impl true
   def handle_event("search_members", %{"member_search" => query}, socket) do
-    # Use existing group.members for filtering; reload only on add/remove
+    # Filter in memory from preloaded candidates; no DB read (R2).
+    candidates = socket.assigns.add_member_candidates || []
+
     socket =
       socket
       |> assign(:member_search_query, query)
-      |> load_available_members(query)
+      |> assign(:available_members, filter_candidates_in_memory(candidates, query))
       |> assign(:show_member_dropdown, true)
       |> assign(:focused_member_index, nil)
 
@@ -656,47 +669,69 @@ defmodule MvWeb.GroupLive.Show do
     end
   end
 
-  defp load_available_members(socket, query) do
+  # Load candidate members once when opening add-member UI (single DB read).
+  defp load_add_member_candidates(socket) do
     require Ash.Query
 
-    current_member_ids = group_member_ids_set(socket.assigns.group)
-    base_query = available_members_base_query(query)
-
-    # Fetch more than 10, then exclude already-in-group and take 10 (avoids empty dropdown when first N are all in group)
-    fetch_limit = 50
-    limited_query = Ash.Query.limit(base_query, fetch_limit)
+    group = socket.assigns.group
+    exclude_ids = group_member_ids_set(group) |> MapSet.to_list()
     actor = current_actor(socket)
 
-    case Ash.read(limited_query, actor: actor, domain: Mv.Membership) do
-      {:ok, members} ->
-        available =
-          members
-          |> Enum.reject(fn m -> MapSet.member?(current_member_ids, m.id) end)
-          |> Enum.take(10)
+    if exclude_ids == [] do
+      # No members in group; load first N members
+      query =
+        Mv.Membership.Member
+        |> Ash.Query.sort([:last_name, :first_name])
+        |> Ash.Query.limit(300)
 
-        assign(socket, available_members: available)
+      do_load_add_member_candidates(socket, query, actor)
+    else
+      query =
+        Mv.Membership.Member
+        |> Ash.Query.filter(expr(id not in ^exclude_ids))
+        |> Ash.Query.sort([:last_name, :first_name])
+        |> Ash.Query.limit(300)
+
+      do_load_add_member_candidates(socket, query, actor)
+    end
+  end
+
+  defp do_load_add_member_candidates(socket, query, actor) do
+    case Ash.read(query, actor: actor, domain: Mv.Membership) do
+      {:ok, candidates} ->
+        socket
+        |> assign(:add_member_candidates, candidates)
+        |> assign(:available_members, Enum.take(candidates, 10))
 
       {:error, error} ->
-        Logger.warning("Failed to load available members for group: #{inspect(error)}")
+        Logger.warning("Failed to load add-member candidates: #{inspect(error)}")
 
         socket
-        |> put_flash(:error, gettext("Could not load member search. Please try again."))
+        |> put_flash(:error, gettext("Could not load member list. Please try again."))
+        |> assign(:add_member_candidates, [])
         |> assign(:available_members, [])
     end
   end
 
-  defp available_members_base_query(query) do
-    search_query = if query && String.trim(query) != "", do: String.trim(query), else: nil
+  # Filter preloaded candidates by query string (name/email). No DB read. R2.
+  defp filter_candidates_in_memory(candidates, query) when is_list(candidates) do
+    q = if is_binary(query), do: String.trim(query) |> String.downcase(), else: ""
 
-    if search_query do
-      Mv.Membership.Member
-      |> Ash.Query.for_read(:search, %{query: search_query})
+    if q == "" do
+      candidates |> Enum.take(10)
     else
-      Mv.Membership.Member
-      |> Ash.Query.new()
+      candidates
+      |> Enum.filter(fn m ->
+        name = MemberHelpers.display_name(m) |> String.downcase()
+        email = (m.email || "") |> String.downcase()
+        String.contains?(name, q) or String.contains?(email, q)
+      end)
+      |> Enum.take(10)
     end
   end
 
+  defp filter_candidates_in_memory(_, _), do: []
+
   defp group_member_ids_set(group) do
     members = group.members || []
     members |> Enum.map(& &1.id) |> MapSet.new()
@@ -736,6 +771,7 @@ defmodule MvWeb.GroupLive.Show do
      |> assign(:show_add_member_input, false)
      |> assign(:member_search_query, "")
      |> assign(:available_members, [])
+     |> assign(:add_member_candidates, [])
      |> assign(:selected_member_ids, [])
      |> assign(:selected_members, [])
      |> assign(:show_member_dropdown, false)
diff --git a/priv/gettext/de/LC_MESSAGES/default.po b/priv/gettext/de/LC_MESSAGES/default.po
index 0d661cf..0caac5c 100644
--- a/priv/gettext/de/LC_MESSAGES/default.po
+++ b/priv/gettext/de/LC_MESSAGES/default.po
@@ -2264,11 +2264,6 @@ msgstr "Nicht berechtigt."
 msgid "Could not load data fields. Please check your permissions."
 msgstr "Datenfelder konnten nicht geladen werden. Bitte überprüfe deine Berechtigungen."
 
-#: lib/mv_web/live/group_live/show.ex
-#, elixir-autogen, elixir-format
-msgid "Could not load member search. Please try again."
-msgstr "Mitgliedersuche konnte nicht geladen werden. Bitte versuchen Sie es erneut."
-
 #: lib/mv_web/live/group_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Add Member"
@@ -2609,17 +2604,7 @@ msgstr "Import"
 msgid "Value type cannot be changed after creation"
 msgstr "Der Wertetyp kann nach dem Erstellen nicht mehr geändert werden."
 
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format, fuzzy
-#~ msgid "Export Members (CSV)"
-#~ msgstr "Mitglieder exportieren (CSV)"
-
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Export functionality will be available in a future release."
-#~ msgstr "Export-Funktionalität ist im nächsten release verfügbar."
-
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Import members from CSV files or export member data."
-#~ msgstr "Importiere Mitglieder aus CSV-Dateien oder exportiere Mitgliederdaten."
+#: lib/mv_web/live/group_live/show.ex
+#, elixir-autogen, elixir-format, fuzzy
+msgid "Could not load member list. Please try again."
+msgstr "Mitgliederliste konnte nicht geladen werden. Bitte versuche es erneut."
diff --git a/priv/gettext/default.pot b/priv/gettext/default.pot
index 0aef1b3..a72caff 100644
--- a/priv/gettext/default.pot
+++ b/priv/gettext/default.pot
@@ -2265,11 +2265,6 @@ msgstr ""
 msgid "Could not load data fields. Please check your permissions."
 msgstr ""
 
-#: lib/mv_web/live/group_live/show.ex
-#, elixir-autogen, elixir-format
-msgid "Could not load member search. Please try again."
-msgstr ""
-
 #: lib/mv_web/live/group_live/show.ex
 #, elixir-autogen, elixir-format
 msgid "Add Member"
@@ -2609,3 +2604,8 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Value type cannot be changed after creation"
 msgstr ""
+
+#: lib/mv_web/live/group_live/show.ex
+#, elixir-autogen, elixir-format
+msgid "Could not load member list. Please try again."
+msgstr ""
diff --git a/priv/gettext/en/LC_MESSAGES/default.po b/priv/gettext/en/LC_MESSAGES/default.po
index 371a028..b8c1bf3 100644
--- a/priv/gettext/en/LC_MESSAGES/default.po
+++ b/priv/gettext/en/LC_MESSAGES/default.po
@@ -2265,11 +2265,6 @@ msgstr ""
 msgid "Could not load data fields. Please check your permissions."
 msgstr ""
 
-#: lib/mv_web/live/group_live/show.ex
-#, elixir-autogen, elixir-format
-msgid "Could not load member search. Please try again."
-msgstr ""
-
 #: lib/mv_web/live/group_live/show.ex
 #, elixir-autogen, elixir-format, fuzzy
 msgid "Add Member"
@@ -2610,17 +2605,7 @@ msgstr ""
 msgid "Value type cannot be changed after creation"
 msgstr ""
 
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format, fuzzy
-#~ msgid "Export Members (CSV)"
-#~ msgstr ""
-
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Export functionality will be available in a future release."
-#~ msgstr ""
-
-#~ #: lib/mv_web/live/import_export_live.ex
-#~ #, elixir-autogen, elixir-format
-#~ msgid "Import members from CSV files or export member data."
-#~ msgstr ""
+#: lib/mv_web/live/group_live/show.ex
+#, elixir-autogen, elixir-format, fuzzy
+msgid "Could not load member list. Please try again."
+msgstr ""