I think you are writing the ones and zeros as bytes, when you should be writing them out as bits.
Here's what you should do to make your program faster. set a counter like i to 0, and then each time you perform a subtraction, do byte_value |= 0 [or 1] << i; i = (i + 1) % 8. Then only do a write after every 8 iterations. Although, you can make the writing process even faster by waiting until you fill thousands of bytes like this, and then just write them all at once in one batch.
This script speeds up the creation of the database.
#@mcdouglasx
import secp256k1 as ice
from bitstring import BitArray
print("Making Binary Data-Base")
target_public_key = "030d282cf2ff536d2c42f105d0b8588821a915dc3f9a05bd98bb23af67a2e92a5b"
target = ice.pub2upub(target_public_key)
num = 16000000 # number of times.
sustract= 1 #amount to subtract each time.
sustract_pub= ice.scalar_multiplication(sustract)
res= ice.point_loop_subtraction(num, target, sustract_pub)
binary = ''
for t in range (num):
h= (res[t*65:t*65+65]).hex()
hc= int(h[2:], 16)
if str(hc).endswith(('0','2','4','6','8')):
A="0"
binary+= ''.join(str(A))
if str(hc).endswith(('1','3','5','7','9')):
A="1"
binary+= ''.join(str(A))
my_str = bytes(BitArray(bin=binary))
binary_file = open('data-base.bin', 'wb')
binary_file.write(my_str)
binary_file.close()
but as @WanderingPhilospher says
This will depend on the amount of RAM you have, of course.