diff --git a/crypto/block/block.h b/crypto/block/block.h
index 6a94f0aa..f2c89286 100644
--- a/crypto/block/block.h
+++ b/crypto/block/block.h
@@ -218,9 +218,12 @@ static inline std::ostream& operator<<(std::ostream& os, const MsgProcessedUptoC
 
 struct ImportedMsgQueueLimits {
   // Default values
-  td::uint32 max_bytes = 1 << 19;
-  td::uint32 max_msgs = 500;
+  td::uint32 max_bytes = 1 << 16;
+  td::uint32 max_msgs = 30;
   bool deserialize(vm::CellSlice& cs);
+  ImportedMsgQueueLimits operator*(td::uint32 x) const {
+    return {max_bytes * x, max_msgs * x};
+  }
 };
 
 struct ParamLimits {
diff --git a/validator/full-node-shard.cpp b/validator/full-node-shard.cpp
index 5fcd62c6..3d9d1923 100644
--- a/validator/full-node-shard.cpp
+++ b/validator/full-node-shard.cpp
@@ -960,26 +960,26 @@ void FullNodeShardImpl::download_out_msg_queue_proof(ShardIdFull dst_shard, std:
       create_tl_shard_id(dst_shard), std::move(blocks_tl),
       create_tl_object<ton_api::tonNode_importedMsgQueueLimits>(limits.max_bytes, limits.max_msgs));
 
-  auto P = td::PromiseCreator::lambda([=, promise = create_neighbour_promise(b, std::move(promise), true),
-                                       blocks = std::move(blocks)](td::Result<td::BufferSlice> R) mutable {
-    if (R.is_error()) {
-      promise.set_result(R.move_as_error());
-      return;
-    }
-    TRY_RESULT_PROMISE(promise, f, fetch_tl_object<ton_api::tonNode_OutMsgQueueProof>(R.move_as_ok(), true));
-    ton_api::downcast_call(
-        *f, td::overloaded(
-                [&](ton_api::tonNode_outMsgQueueProofEmpty &x) {
-                  promise.set_error(td::Status::Error("node doesn't have this block"));
-                },
-                [&](ton_api::tonNode_outMsgQueueProof &x) {
-                  delay_action(
-                      [=, promise = std::move(promise), blocks = std::move(blocks), x = std::move(x)]() mutable {
-                        promise.set_result(OutMsgQueueProof::fetch(dst_shard, blocks, limits, x));
-                      },
-                      td::Timestamp::now());
-                }));
-  });
+  auto P = td::PromiseCreator::lambda(
+      [=, promise = std::move(promise), blocks = std::move(blocks)](td::Result<td::BufferSlice> R) mutable {
+        if (R.is_error()) {
+          promise.set_result(R.move_as_error());
+          return;
+        }
+        TRY_RESULT_PROMISE(promise, f, fetch_tl_object<ton_api::tonNode_OutMsgQueueProof>(R.move_as_ok(), true));
+        ton_api::downcast_call(
+            *f, td::overloaded(
+                    [&](ton_api::tonNode_outMsgQueueProofEmpty &x) {
+                      promise.set_error(td::Status::Error("node doesn't have this block"));
+                    },
+                    [&](ton_api::tonNode_outMsgQueueProof &x) {
+                      delay_action(
+                          [=, promise = std::move(promise), blocks = std::move(blocks), x = std::move(x)]() mutable {
+                            promise.set_result(OutMsgQueueProof::fetch(dst_shard, blocks, limits, x));
+                          },
+                          td::Timestamp::now());
+                    }));
+      });
   td::actor::send_closure(overlays_, &overlay::Overlays::send_query_via, b.adnl_id, adnl_id_, overlay_id_,
                           "get_msg_queue", std::move(P), timeout, std::move(query), 1 << 22, rldp_);
 }
diff --git a/validator/impl/out-msg-queue-proof.cpp b/validator/impl/out-msg-queue-proof.cpp
index d0c3be95..3512bf0d 100644
--- a/validator/impl/out-msg-queue-proof.cpp
+++ b/validator/impl/out-msg-queue-proof.cpp
@@ -285,6 +285,54 @@ void OutMsgQueueImporter::new_masterchain_block_notification(td::Ref<Masterchain
 void OutMsgQueueImporter::get_neighbor_msg_queue_proofs(
     ShardIdFull dst_shard, std::vector<BlockIdExt> blocks, td::Timestamp timeout,
     td::Promise<std::map<BlockIdExt, td::Ref<OutMsgQueueProof>>> promise) {
+  if (blocks.empty()) {
+    promise.set_value({});
+    return;
+  }
+  if (dst_shard.is_masterchain() && blocks.size() != 1) {
+    // We spit queries for masterchain {dst_shard, {block_1, ..., block_n}} into separate queries
+    // {dst_shard, {block_1}}, ..., {dst_shard, {block_n}}
+    class Worker : public td::actor::Actor {
+     public:
+      Worker(size_t pending, td::Promise<std::map<BlockIdExt, td::Ref<OutMsgQueueProof>>> promise)
+          : pending_(pending), promise_(std::move(promise)) {
+        CHECK(pending_ > 0);
+      }
+
+      void on_result(td::Ref<OutMsgQueueProof> res) {
+        result_[res->block_id_] = res;
+        if (--pending_ == 0) {
+          promise_.set_result(std::move(result_));
+          stop();
+        }
+      }
+
+      void on_error(td::Status error) {
+        promise_.set_error(std::move(error));
+        stop();
+      }
+
+     private:
+      size_t pending_;
+      td::Promise<std::map<BlockIdExt, td::Ref<OutMsgQueueProof>>> promise_;
+      std::map<BlockIdExt, td::Ref<OutMsgQueueProof>> result_;
+    };
+    auto worker = td::actor::create_actor<Worker>("queueworker", blocks.size(), std::move(promise)).release();
+    for (const BlockIdExt& block : blocks) {
+      get_neighbor_msg_queue_proofs(dst_shard, {block}, timeout,
+                                    [=](td::Result<std::map<BlockIdExt, td::Ref<OutMsgQueueProof>>> R) {
+                                      if (R.is_error()) {
+                                        td::actor::send_closure(worker, &Worker::on_error, R.move_as_error());
+                                      } else {
+                                        auto res = R.move_as_ok();
+                                        CHECK(res.size() == 1);
+                                        td::actor::send_closure(worker, &Worker::on_result, res.begin()->second);
+                                      }
+                                    });
+    }
+    return;
+  }
+
   std::sort(blocks.begin(), blocks.end());
   auto entry = cache_[{dst_shard, blocks}];
   if (entry) {
@@ -326,7 +374,8 @@ void OutMsgQueueImporter::get_neighbor_msg_queue_proofs(
     ++entry->pending;
     for (size_t i = 0; i < p.second.size(); i += 16) {
       size_t j = std::min(i + 16, p.second.size());
-      get_proof_import(entry, std::vector<BlockIdExt>(p.second.begin() + i, p.second.begin() + j), limits);
+      get_proof_import(entry, std::vector<BlockIdExt>(p.second.begin() + i, p.second.begin() + j),
+                       limits * (td::uint32)(j - i));
     }
   }
   if (entry->pending == 0) {
@@ -341,7 +390,7 @@ void OutMsgQueueImporter::get_proof_local(std::shared_ptr<CacheEntry> entry, Blo
   td::actor::send_closure(
       manager_, &ValidatorManager::wait_block_state_short, block, 0, entry->timeout,
       [=, SelfId = actor_id(this), manager = manager_, timeout = entry->timeout,
-       retry_after = td::Timestamp::in(0.5)](td::Result<Ref<ShardState>> R) mutable {
+       retry_after = td::Timestamp::in(0.1)](td::Result<Ref<ShardState>> R) mutable {
         if (R.is_error()) {
           LOG(DEBUG) << "Failed to get block state for " << block.to_str() << ": " << R.move_as_error();
           delay_action([=]() { td::actor::send_closure(SelfId, &OutMsgQueueImporter::get_proof_local, entry, block); },
@@ -380,7 +429,7 @@ void OutMsgQueueImporter::get_proof_import(std::shared_ptr<CacheEntry> entry, st
   }
   td::actor::send_closure(
       manager_, &ValidatorManager::send_get_out_msg_queue_proof_request, entry->dst_shard, blocks, limits,
-      [=, SelfId = actor_id(this), retry_after = td::Timestamp::in(0.5),
+      [=, SelfId = actor_id(this), retry_after = td::Timestamp::in(0.1),
        dst_shard = entry->dst_shard](td::Result<std::vector<td::Ref<OutMsgQueueProof>>> R) {
         if (R.is_error()) {
           LOG(DEBUG) << "Failed to get out msg queue for " << dst_shard.to_str() << ": " << R.move_as_error();
diff --git a/validator/manager.cpp b/validator/manager.cpp
index 955334db..af5a7c37 100644
--- a/validator/manager.cpp
+++ b/validator/manager.cpp
@@ -478,6 +478,10 @@ void ValidatorManagerImpl::add_shard_block_description(td::Ref<ShardTopBlockDesc
       });
       wait_block_state_short(desc->block_id(), 0, td::Timestamp::in(60.0), std::move(P));
     }
+    if (collating_masterchain() && desc->generated_at() > td::Clocks::system() - 20) {
+      wait_neighbor_msg_queue_proofs(ShardIdFull{masterchainId}, {desc->block_id()}, td::Timestamp::in(15.0),
+                                     [](td::Result<std::map<BlockIdExt, td::Ref<OutMsgQueueProof>>>) {});
+    }
   }
 }
 
@@ -2525,6 +2529,16 @@ bool ValidatorManagerImpl::validating_masterchain() {
               .is_zero();
 }
 
+bool ValidatorManagerImpl::collating_masterchain() {
+  if (masterchain_collators_) {
+    return true;
+  }
+  if (opts_->validator_mode() == ValidatorManagerOptions::validator_lite_all) {
+    return false;
+  }
+  return validating_masterchain();
+}
+
 PublicKeyHash ValidatorManagerImpl::get_validator(ShardIdFull shard, td::Ref<ValidatorSet> val_set) {
   for (auto &key : temp_keys_) {
     if (val_set->is_validator(key.bits256_value())) {
@@ -2726,7 +2740,12 @@ void ValidatorManagerImpl::add_collator(adnl::AdnlNodeIdShort id, ShardIdFull sh
     it = collator_nodes_.emplace(id, Collator()).first;
     it->second.actor = td::actor::create_actor<CollatorNode>("collatornode", id, actor_id(this), adnl_, rldp_);
   }
-  it->second.shards.insert(shard);
+  if (!it->second.shards.insert(shard).second) {
+    return;
+  }
+  if (shard.is_masterchain()) {
+    ++masterchain_collators_;
+  }
   td::actor::send_closure(it->second.actor, &CollatorNode::add_shard, shard);
 }
 
@@ -2735,10 +2754,16 @@ void ValidatorManagerImpl::del_collator(adnl::AdnlNodeIdShort id, ShardIdFull sh
   if (it == collator_nodes_.end()) {
     return;
   }
-  td::actor::send_closure(it->second.actor, &CollatorNode::del_shard, shard);
-  it->second.shards.erase(shard);
+  if (!it->second.shards.erase(shard)) {
+    return;
+  }
+  if (shard.is_masterchain()) {
+    --masterchain_collators_;
+  }
   if (it->second.shards.empty()) {
     collator_nodes_.erase(it);
+  } else {
+    td::actor::send_closure(it->second.actor, &CollatorNode::del_shard, shard);
   }
 }
 
diff --git a/validator/manager.hpp b/validator/manager.hpp
index ce5254ac..f8ca08f3 100644
--- a/validator/manager.hpp
+++ b/validator/manager.hpp
@@ -506,6 +506,7 @@ class ValidatorManagerImpl : public ValidatorManager {
   bool is_validator();
   bool is_collator();
   bool validating_masterchain();
+  bool collating_masterchain();
   PublicKeyHash get_validator(ShardIdFull shard, td::Ref<ValidatorSet> val_set);
 
   ValidatorManagerImpl(td::Ref<ValidatorManagerOptions> opts, std::string db_root,
@@ -650,6 +651,7 @@ class ValidatorManagerImpl : public ValidatorManager {
     std::set<ShardIdFull> shards;
   };
   std::map<adnl::AdnlNodeIdShort, Collator> collator_nodes_;
+  size_t masterchain_collators_ = 0;
 
   std::set<ShardIdFull> extra_active_shards_;
   std::map<ShardIdFull, BlockSeqno> last_validated_blocks_;