diff --git a/tig-benchmarker/slave.py b/tig-benchmarker/slave.py
index 88a0d0e4..4d8a51ed 100644
--- a/tig-benchmarker/slave.py
+++ b/tig-benchmarker/slave.py
@@ -7,6 +7,7 @@ import requests
 import shutil
 import subprocess
 import time
+import zlib
 from threading import Thread
 from common.structs import OutputData, MerkleProof
 from common.merkle_tree import MerkleTree
@@ -98,10 +99,7 @@ def send_results(session, master_ip, master_port, tig_worker_path, download_wasm
 
     if (
         not os.path.exists(f"{output_folder}/result.json")
-        or not all(
-            os.path.exists(f"{output_folder}/{nonce}.json") 
-            for nonce in range(batch["start_nonce"], batch["start_nonce"] + batch["num_nonces"])
-        )
+        or not os.path.exists(f"{output_folder}/data.zlib")
     ):
         if os.path.exists(f"{output_folder}/result.json"):
             os.remove(f"{output_folder}/result.json")
@@ -128,8 +126,11 @@ def send_results(session, master_ip, master_port, tig_worker_path, download_wasm
             time.sleep(2)
 
     else:
-        with open(f"{output_folder}/data.json") as f:
-            leafs = [OutputData.from_dict(x) for x in json.load(f)]
+        with open(f"{output_folder}/data.zlib", "rb") as f:
+            leafs = [
+                OutputData.from_dict(x) 
+                for x in json.loads(zlib.decompress(f.read()).decode())
+            ]
             
         merkle_tree = MerkleTree(
             [x.to_merkle_hash() for x in leafs],
diff --git a/tig-worker/src/main.rs b/tig-worker/src/main.rs
index f7667437..aec620ee 100644
--- a/tig-worker/src/main.rs
+++ b/tig-worker/src/main.rs
@@ -5,7 +5,7 @@ use futures::stream::{self, StreamExt};
 use serde_json::json;
 use std::{fs, path::PathBuf, sync::Arc};
 use tig_structs::core::BenchmarkSettings;
-use tig_utils::{dejsonify, jsonify, MerkleHash, MerkleTree};
+use tig_utils::{compress_obj, dejsonify, jsonify, MerkleHash, MerkleTree};
 use tig_worker::OutputData;
 use tokio::runtime::Runtime;
 
@@ -272,8 +272,8 @@ fn compute_batch(
         }
         if let Some(path) = output_folder {
             dump.sort_by_key(|data| data.nonce);
-            let file_path = path.join("data.json");
-            fs::write(&file_path, jsonify(&dump))?;
+            let file_path = path.join("data.zlib");
+            fs::write(&file_path, compress_obj(&dump))?;
         }
 
         let tree = MerkleTree::new(hashes, batch_size as usize)?;