diff --git a/warc_wat_url_processor.py b/warc_wat_url_processor.py
index 7b7f177..620af0b 100644
--- a/warc_wat_url_processor.py
+++ b/warc_wat_url_processor.py
@@ -43,10 +43,11 @@ def process_file(file_path):
         command_compress = f'zstd -T0 -12 --long {output_file_path} -o {compressed_file_path}'
 
         # Run the compression command synchronously and wait for it to complete
-        compression_process = subprocess.Popen(command_compress, shell=True)
-        compression_process.communicate()
-
-        print(f"Compressed file saved as '{compressed_file_path}'")
+        result = subprocess.run(command_compress, shell=True, check=True)
+        if result.returncode == 0:
+            print(f"Compressed file saved as '{compressed_file_path}'")
+        else:
+            print(f"Compression failed for '{output_file_path}'")
 
         # Remove the original gzipped file
         os.remove(file_path)
@@ -59,7 +60,8 @@ def process_file(file_path):
         # Remove the line containing the filename (without "_urls.txt") from urls_to_download.txt
         filename = os.path.basename(output_file_path).replace('_urls.txt', '')
         command = f'sed -i "/{filename}/d" "urls_to_download.txt"'
-        if subprocess.run(command, shell=True).returncode == 0:
+        result = subprocess.run(command, shell=True)
+        if result.returncode == 0:
             print(f"File {filename} has been successfully removed from urls_to_download.txt")
             with open('urls_to_download.txt', 'r') as file:
                 remaining_count = sum(1 for line in file)
@@ -73,10 +75,14 @@ def process_file(file_path):
 
 def download_and_process_file(url):
     try:
-        command = f'axel -n 4 {url}'
-        subprocess.run(command, shell=True)
-        file_path = os.path.join(os.getcwd(), os.path.basename(url))
-        process_file(file_path)
+        command = f'axel -n 3 {url}'
+        result = subprocess.run(command, shell=True, check=True)
+        if result.returncode == 0:
+            file_path = os.path.join(os.getcwd(), os.path.basename(url))
+            process_file(file_path)
+        else:
+            print(f"Download failed for {url}")
+
     except Exception as e:
         print(f"Error during download and processing {url}: {e}")
 
@@ -93,7 +99,7 @@ def main():
         futures = [executor.submit(download_and_process_file, url) for url in urls]
 
         # Wait for all downloads and processing to complete before starting the next iteration
-        wait(futures)
+        as_completed(futures)
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()