speed of gate bootstrapping

[zj-rayan]

I tried to test the speed of nufhe gate bootstrapping by the following way but found it much slower than the result shown in nufhe's main page(0.13ms)，how can I get appropriate test result？My GPU is GTX 1660Ti.

import random
import nufhe
import time

size = 32
bits1 = [random.choice([False, True]) for i in range(size)]
bits2 = [random.choice([False, True]) for i in range(size)]
reference = [not (b1 and b2) for b1, b2 in zip(bits1, bits2)]

ctx = nufhe.Context()
secret_key, cloud_key = ctx.make_key_pair()

ciphertext1 = ctx.encrypt(secret_key, bits1)
ciphertext2 = ctx.encrypt(secret_key, bits2)

vm = ctx.make_virtual_machine(cloud_key)
t1 = time.time()
result = vm.gate_nand(ciphertext1, ciphertext2)
t2 = time.time()
print(t2-t1) # around 3.0s
result_bits = ctx.decrypt(secret_key, result)

assert all(result_bits == reference)