I have a HP15-R203TX notebook with CPU i5-5200U 2.20GHzx4 / RAM 4Gb /2 Gb NVIDIA GeForce 820M. My friend has the same notebook. Another one has a dell notebook but same graphic card.
When i ran same jupyter notebook on same dataset to train the same number of layers, it takes 20 minutes on mine but 6-8 minutes on both of my friend's.
I tried resetting the whole environment, but didn't helped.