1 second on a CPU can easily be 100x faster on a GPU, then distributed over 1000's of GPUs. For reference argon2 was supposed to be an ASIC-resistant, GPU-resistant memory-hard hashing algorithm, but a K20X from 2013 is 5x faster than a CPU [1] and GPUs have only gotten faster since then compared to CPUs.
[1]: https://github.com/WebDollar/argon2-gpu