keyhunt not good

i get a test with key hunt


you can test it.  key hunt speed in my pc is  60 Mk/s


i search for  this addrrss   1E5V4LbVrTbFrfj7VN876DamzkaNiGAvFo
this privatekey is  200000000000f4240

search start of 20000000000000000


this private key is 1,000,000 key of start

in fact keyhunt must be find in 2 sec , but fin at 100 Sec

In the Cuda programming, an algorithm is executed in parallel, and in fact, this search operation in each core performs a similar task in parallel, and the cores do not help each other's process to increase the search speed, but each of them works as an island exactly the same way. They do something else and that's why this program has problems