diff --git admin/user/user_bulk_download.php admin/user/user_bulk_download.php
index 9d1a61a..6732914 100644
--- admin/user/user_bulk_download.php
+++ admin/user/user_bulk_download.php
@@ -92,25 +92,26 @@ function user_download_ods($fields) {
     }
 
     $row = 1;
-    foreach ($SESSION->bulk_users as $userid) {
-        if (!$user = $DB->get_record('user', array('id'=>$userid))) {
-            continue;
-        }
-        $col = 0;
-        profile_load_data($user);
-        foreach ($fields as $field=>$unused) {
-            $worksheet[0]->write($row, $col, $user->$field);
-            $col++;
-        }
-        $row++;
-    }
+	sort($SESSION->bulk_users);
+	$users_chunked = array_chunk($SESSION->bulk_users, 1000);
+	foreach ($users_chunked as $user_ids) {
+        $users = user_download_prepare($user_ids);
+		foreach ($users as $user) {
+			$col = 0;
+			foreach ($fields as $field=>$unused) {
+				$worksheet[0]->write($row, $col, $user->{$field});
+				$col++;
+			}
+			$row++;
+		}
+	}
 
     $workbook->close();
     die;
 }
 
 function user_download_xls($fields) {
-    global $CFG, $SESSION, $DB;
+    global $CFG, $SESSION;
 
     require_once("$CFG->libdir/excellib.class.php");
     require_once($CFG->dirroot.'/user/profile/lib.php');
@@ -129,19 +130,27 @@ function user_download_xls($fields) {
         $col++;
     }
 
-    $row = 1;
-    foreach ($SESSION->bulk_users as $userid) {
-        if (!$user = $DB->get_record('user', array('id'=>$userid))) {
-            continue;
-        }
-        $col = 0;
-        profile_load_data($user);
-        foreach ($fields as $field=>$unused) {
-            $worksheet[0]->write($row, $col, $user->$field);
-            $col++;
-        }
-        $row++;
-    }
+	$row = 1;
+	sort($SESSION->bulk_users);
+	$users_chunked = array_chunk($SESSION->bulk_users, 1000);
+	foreach ($users_chunked as $user_ids) {
+		
+		$users = user_download_prepare($user_ids);
+		if (empty($users)) {
+			$workbook->close();
+			die;
+		}
+
+		foreach ($users as $user) {
+			$col = 0;
+			foreach ($fields as $field=>$unused) {
+				$value = (isset($user->{$field})) ? $user->{$field} : "";
+				$worksheet[0]->write($row, $col, $value);
+				$col++;
+			}
+			$row++;
+		}
+	}
 
     $workbook->close();
     die;
@@ -159,25 +168,62 @@ function user_download_csv($fields) {
     $csvexport->set_filename($filename);
     $csvexport->add_data($fields);
 
-    foreach ($SESSION->bulk_users as $userid) {
-        $row = array();
-        if (!$user = $DB->get_record('user', array('id'=>$userid))) {
-            continue;
-        }
-        profile_load_data($user);
-        $userprofiledata = array();
-        foreach ($fields as $field=>$unused) {
-            // Custom user profile textarea fields come in an array
-            // The first element is the text and the second is the format.
-            // We only take the text.
-            if (is_array($user->$field)) {
-                $userprofiledata[] = reset($user->$field);
-            } else {
-                $userprofiledata[] = $user->$field;
-            }
-        }
-        $csvexport->add_data($userprofiledata);
+	sort($SESSION->bulk_users);
+	$users_chunked = array_chunk($SESSION->bulk_users, 1000);
+	foreach ($users_chunked as $user_ids) {
+        $users = user_download_prepare($user_ids);
+		foreach ($users as $user) {
+			$userprofiledata = array();
+			foreach ($fields as $field=>$unused) {
+				// Custom user profile textarea fields come in an array
+				// The first element is the text and the second is the format.
+				// We only take the text.
+				if (is_array($user->{$field})) {
+					$userprofiledata[] = reset($user->{$field});
+				} else {
+					$userprofiledata[] = $user->{$field};
+				}
+			}
+			$csvexport->add_data($userprofiledata);
+		}
     }
     $csvexport->download_file();
     die;
 }
+
+function user_download_prepare($user_ids) {
+	global $DB;
+	
+	if (empty($user_ids)) {
+		return false;
+	}
+
+	// Fetch basic user data first.
+	list ($in_or_equal, $params) = $DB->get_in_or_equal($user_ids, SQL_PARAMS_NAMED, 'id');
+	$sql = "SELECT * FROM {user} WHERE id " . $in_or_equal . " ORDER BY id";
+	$users = $DB->get_records_sql($sql, $params);
+	if (empty($users)) {
+		return false;
+	}
+	
+	// Then fetch the custom profile fields, if any.
+	$pseudo_id = $DB->sql_concat('uid.userid', "'-'", 'uif.shortname');
+	list ($in_or_equal, $params) = $DB->get_in_or_equal($user_ids, SQL_PARAMS_NAMED, 'userid');
+	$sql = "SELECT 
+			". $pseudo_id ." AS id,
+			uid.userid, 
+			uif.shortname, 
+			uid.data 
+		FROM {user_info_data} AS uid
+		LEFT JOIN {user_info_field} AS uif ON uif.id = uid.fieldid
+		WHERE uid.userid " . $in_or_equal ."
+		ORDER BY uid.userid";
+	$users_data_raw = $DB->get_records_sql($sql, $params);
+	// Append this data to $users.
+	foreach ($users_data_raw as $udr) {
+		$users[$udr->userid]->{'profile_field_'.$udr->shortname} = $udr->data;
+	}
+	unset($users_data_raw); // saves some memory
+	
+	return $users;
+}