s.py

import time
import numpy as np
                                                                                            
a = np.zeros((1080 * 4, 1920, 3))                                                           
last_time = time.time() * 1000                                                              
    
for i in range(1000) :                                                                      
  np.save('{}.npy'.format(i), a)                                                            
    
  now = time.time() * 1000                                                                  
  print(i, now - last_time)                                                                 
  last_time = now                                                                           
  
    
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