diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index e00908125..7ecdae48c 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -59,6 +59,8 @@
 #undef MONERO_DEFAULT_LOG_CATEGORY
 #define MONERO_DEFAULT_LOG_CATEGORY "blockchain"
 
+#define FIND_BLOCKCHAIN_SUPPLEMENT_MAX_SIZE (100*1024*1024) // 100 MB
+
 //#include "serialization/json_archive.h"
 
 /* TODO:
@@ -2075,8 +2077,8 @@ bool Blockchain::find_blockchain_supplement(const uint64_t req_start_block, cons
 
   m_db->block_txn_start(true);
   total_height = get_current_blockchain_height();
-  size_t count = 0;
-  for(size_t i = start_height; i < total_height && count < max_count; i++, count++)
+  size_t count = 0, size = 0;
+  for(size_t i = start_height; i < total_height && count < max_count && (size < FIND_BLOCKCHAIN_SUPPLEMENT_MAX_SIZE || count < 3); i++, count++)
   {
     blocks.resize(blocks.size()+1);
     blocks.back().first = m_db->get_block_blob_from_height(i);
@@ -2085,6 +2087,9 @@ bool Blockchain::find_blockchain_supplement(const uint64_t req_start_block, cons
     std::list<crypto::hash> mis;
     get_transactions_blobs(b.tx_hashes, blocks.back().second, mis);
     CHECK_AND_ASSERT_MES(!mis.size(), false, "internal error, transaction from block not found");
+    size += blocks.back().first.size();
+    for (const auto &t: blocks.back().second)
+      size += t.size();
   }
   m_db->block_txn_stop();
   return true;
diff --git a/src/rpc/core_rpc_server.cpp b/src/rpc/core_rpc_server.cpp
index a5de36118..1d3d31c74 100644
--- a/src/rpc/core_rpc_server.cpp
+++ b/src/rpc/core_rpc_server.cpp
@@ -205,14 +205,17 @@ namespace cryptonote
       }
       size_t txidx = 0;
       ntxes += bd.second.size();
-      for(const auto& t: bd.second)
+      for (std::list<cryptonote::blobdata>::iterator i = bd.second.begin(); i != bd.second.end(); ++i)
       {
+        unpruned_size += i->size();
         if (req.prune)
-          res.blocks.back().txs.push_back(get_pruned_tx_blob(t));
+          res.blocks.back().txs.push_back(get_pruned_tx_blob(std::move(*i)));
         else
-          res.blocks.back().txs.push_back(t);
+          res.blocks.back().txs.push_back(std::move(*i));
+        i->clear();
+        i->shrink_to_fit();
         pruned_size += res.blocks.back().txs.back().size();
-        unpruned_size += t.size();
+
         res.output_indices.back().indices.push_back(COMMAND_RPC_GET_BLOCKS_FAST::tx_output_indices());
         bool r = m_core.get_tx_outputs_gindexs(b.tx_hashes[txidx++], res.output_indices.back().indices.back().indices);
         if (!r)