diff --git a/src/librmb/rados-mail-object.cpp b/src/librmb/rados-mail-object.cpp
index bd2cd27c..13c79e09 100644
--- a/src/librmb/rados-mail-object.cpp
+++ b/src/librmb/rados-mail-object.cpp
@@ -62,17 +62,22 @@ std::string RadosMailObject::to_string(const string &padding) {
   ostringstream ss;
 
   ss << endl;
-  ss << padding << "MAIL:   " << static_cast<char>(RBOX_METADATA_MAIL_UID) << "(uid)=" << uid << endl;
-  ss << padding << "        "
-     << "oid = " << oid << endl;
+  ss << padding << "MAIL:   ";
+  if (!uid.empty()) {
+    ss << static_cast<char>(RBOX_METADATA_MAIL_UID) << "(uid)=" << uid << endl;
+    ss << padding << "        ";
+  }
+  ss << "oid = " << oid << endl;
   string recv_time;
   if (RadosUtils::convert_time_t_to_str(ts, &recv_time) >= 0) {
     ss << padding << "        " << static_cast<char>(RBOX_METADATA_RECEIVED_TIME) << "(receive_time)=" << recv_time
        << "\n";
   } else {
-    ss << padding << "        " << static_cast<char>(RBOX_METADATA_RECEIVED_TIME) << "(receive_time)= INVALID DATE : '"
-       << recv_time_str << "'"
-       << "\n";
+    if (!recv_time_str.empty()) {
+      ss << padding << "        " << static_cast<char>(RBOX_METADATA_RECEIVED_TIME)
+         << "(receive_time)= INVALID DATE : '" << recv_time_str << "'"
+         << "\n";
+    }
   }
   string save_time;
   if (RadosUtils::convert_time_t_to_str(save_date_rados, &save_time) >= 0) {
@@ -82,18 +87,21 @@ std::string RadosMailObject::to_string(const string &padding) {
     ss << padding << "        "
        << "save_time= INVALID DATE '" << save_date_rados << "'\n";
   }
+
   ss << padding << "        " << static_cast<char>(RBOX_METADATA_PHYSICAL_SIZE) << "(phy_size)=" << p_size << " "
      << static_cast<char>(RBOX_METADATA_VIRTUAL_SIZE) << "(v_size) = " << v_size << " stat_size=" << object_size
      << endl;
-  ss << padding << "        " << static_cast<char>(RBOX_METADATA_MAILBOX_GUID) << "(mailbox_guid)=" << mailbox_guid
-     << endl;
-
+  if (!mailbox_guid.empty()) {
+    ss << padding << "        " << static_cast<char>(RBOX_METADATA_MAILBOX_GUID) << "(mailbox_guid)=" << mailbox_guid
+       << endl;
+  }
   if (mb_orig_name.length() > 0) {
     ss << padding << "        " << static_cast<char>(RBOX_METADATA_ORIG_MAILBOX)
        << "(mailbox_orig_name)=" << mb_orig_name << endl;
   }
-  ss << padding << "        " << static_cast<char>(RBOX_METADATA_GUID) << "(mail_guid)=" << mail_guid << endl;
-
+  if (!mail_guid.empty()) {
+    ss << padding << "        " << static_cast<char>(RBOX_METADATA_GUID) << "(mail_guid)=" << mail_guid << endl;
+  }
   if (rbox_version.length() > 0) {
     ss << padding << "        " << static_cast<char>(RBOX_METADATA_VERSION) << "(rbox_version): " << rbox_version
        << endl;
diff --git a/src/librmb/tools/rmb/rmb-commands.cpp b/src/librmb/tools/rmb/rmb-commands.cpp
index 385cf1b0..81d65366 100644
--- a/src/librmb/tools/rmb/rmb-commands.cpp
+++ b/src/librmb/tools/rmb/rmb-commands.cpp
@@ -12,6 +12,7 @@
 #include "rmb-commands.h"
 #include <algorithm>  // std::sort
 #include <cstdio>
+#include <time.h>
 
 #include "../../rados-cluster-impl.h"
 #include "../../rados-storage-impl.h"
@@ -311,69 +312,105 @@ bool RmbCommands::sort_save_date(librmb::RadosMailObject *i, librmb::RadosMailOb
   return *i->get_rados_save_date() < *j->get_rados_save_date();
 }
 
+struct AioStat {
+  librmb::RadosMailObject *mail;
+  std::vector<librmb::RadosMailObject *> *mail_objects;
+  uint64_t object_size = 0;
+  time_t save_date_rados;
+  librados::AioCompletion *completion;
+};
+
+static void aio_cb(rados_completion_t cb, void *arg) {
+  AioStat *stat = static_cast<AioStat *>(arg);
+  if (stat->completion->get_return_value() == 0) {
+    stat->mail->set_mail_size(stat->object_size);
+    stat->mail->set_rados_save_date(stat->save_date_rados);
+    stat->mail_objects->push_back(stat->mail);
+  } else {
+    std::cout << " object '" << stat->mail->get_oid() << "' is not a valid mail object, size = 0" << std::endl;
+    delete stat->mail;
+  }
+  delete stat;
+}
 int RmbCommands::load_objects(librmb::RadosStorageMetadataModule *ms,
-                              std::vector<librmb::RadosMailObject *> &mail_objects, std::string &sort_string) {
+                              std::vector<librmb::RadosMailObject *> &mail_objects, std::string &sort_string,
+                              bool load_metadata) {
+  time_t begin = time(NULL);
+
   print_debug("entry: load_objects");
   if (ms == nullptr || storage == nullptr) {
     print_debug("end: load_objects");
     return -1;
   }
-  // get load all objects metadata into memory
+  std::list<librados::AioCompletion *> completions;
+  // load all objects metadata into memory
   librados::NObjectIterator iter(storage->find_mails(nullptr));
   while (iter != librados::NObjectIterator::__EndObjectIterator) {
     librmb::RadosMailObject *mail = new librmb::RadosMailObject();
+    AioStat *stat = new AioStat();
+    stat->mail = mail;
+    stat->mail_objects = &mail_objects;
+
     std::string oid = iter->get_oid();
-    uint64_t object_size = 0;
-    time_t save_date_rados;
-    int ret = storage->stat_mail(oid, &object_size, &save_date_rados);
-    if (ret != 0 || object_size == 0) {
+    stat->completion = librados::Rados::aio_create_completion(static_cast<void *>(stat), aio_cb, NULL);
+    int ret = storage->get_io_ctx().aio_stat(oid, stat->completion, &stat->object_size, &stat->save_date_rados);
+    if (ret != 0) {
       std::cout << " object '" << oid << "' is not a valid mail object, size = 0" << std::endl;
       ++iter;
       delete mail;
+      delete stat;
       continue;
     }
+    completions.push_back(stat->completion);
     mail->set_oid(oid);
-    if (ms->load_metadata(mail) < 0) {
-      std::cout << " loading metadata of object '" << oid << "' faild " << std::endl;
-      ++iter;
-      delete mail;
-      continue;
-    }
+    if (load_metadata) {
+      if (ms->load_metadata(mail) < 0) {
+        std::cout << " loading metadata of object '" << oid << "' faild " << std::endl;
+        ++iter;
+        delete mail;
+        continue;
+      }
 
-    if (mail->get_metadata()->empty()) {
-      std::cout << " pool object " << oid << " is not a mail object" << std::endl;
-      ++iter;
-      delete mail;
-      continue;
-    }
+      if (mail->get_metadata()->empty()) {
+        std::cout << " pool object " << oid << " is not a mail object" << std::endl;
+        ++iter;
+        delete mail;
+        continue;
+      }
 
-    if (!librmb::RadosUtils::validate_metadata(mail->get_metadata())) {
-      std::cout << "object : " << oid << " metadata is not valid " << std::endl;
-      ++iter;
-      delete mail;
-      continue;
+      if (!librmb::RadosUtils::validate_metadata(mail->get_metadata())) {
+        std::cout << "object : " << oid << " metadata is not valid " << std::endl;
+        ++iter;
+        delete mail;
+        continue;
+      }
     }
 
-    mail->set_mail_size(object_size);
-    mail->set_rados_save_date(save_date_rados);
     ++iter;
-    mail_objects.push_back(mail);
     if (is_debug) {
       std::cout << "added: mail " << mail->get_oid() << std::endl;
     }
   }
 
-  if (sort_string.compare("uid") == 0) {
-    std::sort(mail_objects.begin(), mail_objects.end(), sort_uid);
-  } else if (sort_string.compare("recv_date") == 0) {
-    std::sort(mail_objects.begin(), mail_objects.end(), sort_recv_date);
-  } else if (sort_string.compare("phy_size") == 0) {
-    std::sort(mail_objects.begin(), mail_objects.end(), sort_phy_size);
-  } else {
-    std::sort(mail_objects.begin(), mail_objects.end(), sort_save_date);
+  for (std::list<librados::AioCompletion *>::iterator it = completions.begin(); it != completions.end(); ++it) {
+    (*it)->wait_for_complete_and_cb();
+    (*it)->release();
+  }
+  if (load_metadata) {
+    if (sort_string.compare("uid") == 0) {
+      std::sort(mail_objects.begin(), mail_objects.end(), sort_uid);
+    } else if (sort_string.compare("recv_date") == 0) {
+      std::sort(mail_objects.begin(), mail_objects.end(), sort_recv_date);
+    } else if (sort_string.compare("phy_size") == 0) {
+      std::sort(mail_objects.begin(), mail_objects.end(), sort_phy_size);
+    } else {
+      std::sort(mail_objects.begin(), mail_objects.end(), sort_save_date);
+    }
   }
+  time_t end = time(NULL);
 
   print_debug("end: load_objects");
+  std::cout << " time elapsed loading objects: " << (end - begin) << std::endl;
   return 0;
 }
 
diff --git a/src/librmb/tools/rmb/rmb-commands.h b/src/librmb/tools/rmb/rmb-commands.h
index 34fcec75..cf1ea5e2 100644
--- a/src/librmb/tools/rmb/rmb-commands.h
+++ b/src/librmb/tools/rmb/rmb-commands.h
@@ -50,7 +50,7 @@ class RmbCommands {
   int configuration(bool confirmed, librmb::RadosCephConfig &ceph_cfg);
 
   int load_objects(librmb::RadosStorageMetadataModule *ms, std::vector<librmb::RadosMailObject *> &mail_objects,
-                   std::string &sort_string);
+                   std::string &sort_string, bool load_metadata = true);
   int update_attributes(librmb::RadosStorageMetadataModule *ms, std::map<std::string, std::string> *metadata);
   int print_mail(std::map<std::string, librmb::RadosMailBox *> *mailbox, std::string &output_dir, bool download);
   int query_mail_storage(std::vector<librmb::RadosMailObject *> *mail_objects, librmb::CmdLineParser *parser,
diff --git a/src/storage-rbox/doveadm-rbox-plugin.cpp b/src/storage-rbox/doveadm-rbox-plugin.cpp
index b2a52be0..80da193a 100644
--- a/src/storage-rbox/doveadm-rbox-plugin.cpp
+++ b/src/storage-rbox/doveadm-rbox-plugin.cpp
@@ -128,7 +128,7 @@ static int cmd_rmb_config(std::map<std::string, std::string> &opts, struct mail_
 
 static int cmd_rmb_search_run(std::map<std::string, std::string> &opts, struct mail_user *user, bool download,
                               librmb::CmdLineParser &parser, std::vector<librmb::RadosMailObject *> &mail_objects,
-                              bool silent) {
+                              bool silent, bool load_metadata = true) {
   RboxDoveadmPlugin plugin;
   int open = open_connection_load_config(&plugin, user);
   if (open < 0) {
@@ -149,7 +149,7 @@ static int cmd_rmb_search_run(std::map<std::string, std::string> &opts, struct m
     return 0;
   }
 
-  int ret = rmb_cmds.load_objects(ms, mail_objects, opts["sort"]);
+  int ret = rmb_cmds.load_objects(ms, mail_objects, opts["sort"], load_metadata);
   if (ret < 0) {
     i_error("Error loading ceph objects. Errorcode: %d", ret);
     delete ms;
@@ -673,7 +673,7 @@ static int cmd_rmb_check_indices_run(struct doveadm_mail_cmd_context *ctx, struc
   librmb::CmdLineParser parser(opts["ls"]);
   parser.parse_ls_string();
   std::vector<librmb::RadosMailObject *> mail_objects;
-  ret = cmd_rmb_search_run(opts, user, false, parser, mail_objects, true);
+  ret = cmd_rmb_search_run(opts, user, false, parser, mail_objects, true, false);
   if (ret < 0) {
     return ret;
   }