Refactor most getServerProps to fetch independent request in parallel and projected the data only to return the necessary fields and changed some functions

src/pages/dashboard/teacher.tsx

@@ -27,6 +27,7 @@ import { requestUser } from "@/utils/api";
 import { useAllowedEntities } from "@/hooks/useEntityPermissions";
 import { getEntitiesUsers } from "@/utils/users.be";
 import { isAdmin } from "@/utils/users";
+import { useMemo } from "react";
 
 interface Props {
   user: User;
@@ -52,29 +53,29 @@ export const getServerSideProps = withIronSessionSsr(async ({ req, res }) => {
 
   const filteredEntities = findAllowedEntities(user, entities, "view_students");
 
-  const students = await getEntitiesUsers(
-    mapBy(filteredEntities, "id"),
-    {
-      type: "student",
-    },
-    0,
-    {
-      _id: 0,
-      id: 1,
-      name: 1,
-      email: 1,
-      profilePicture: 1,
-      levels: 1,
-      registrationDate: 1,
-    }
-  );
-
-  const assignments = await getEntitiesAssignments(entityIDS);
+  const [students, assignments, groups] = await Promise.all([
+    getEntitiesUsers(
+      mapBy(filteredEntities, "id"),
+      {
+        type: "student",
+      },
+      0,
+      {
+        _id: 0,
+        id: 1,
+        name: 1,
+        email: 1,
+        profilePicture: 1,
+        levels: 1,
+        registrationDate: 1,
+      }
+    ),
+    getEntitiesAssignments(entityIDS),
+    getGroupsByEntities(entityIDS),
+  ]);
 
   const stats = await getStatsByUsers(students.map((u) => u.id));
 
-  const groups = await getGroupsByEntities(entityIDS);
-
   return {
     props: serialize({ user, students, entities, assignments, stats, groups }),
   };
@@ -100,6 +101,10 @@ export default function Dashboard({
     entities,
     "view_student_performance"
   );
+  const entitiesLabels = useMemo(
+    () => mapBy(entities, "label")?.join(", "),
+    [entities]
+  );
 
   return (
     <>
@@ -117,7 +122,7 @@ export default function Dashboard({
         <div className="w-full flex flex-col gap-4">
           {entities.length > 0 && (
             <div className="w-fit self-end bg-neutral-200 px-2 rounded-lg py-1">
-              <b>{mapBy(entities, "label")?.join(", ")}</b>
+              <b>{entitiesLabels}</b>
             </div>
           )}
           <section className="grid grid-cols-5 -md:grid-cols-2 place-items-center gap-4 text-center">