With the linked implementation (there is at least 1 fork rewriting the matlab bits in python) the three steps needed per image amount to probably over an hour o

With the linked implementation (there is at least 1 fork rewriting the matlab bits in python) the three steps needed per image amount to probably over an hour on one k80. However, you probably need the -backend cudnn and -cudnn_autotune flags not to run out of memory. Downscaling the images from currently 700 to say 500 significantly speeds up the process as well. Still, it definitely takes longer than neural style.