The hard fork did not cause significant problems in the main bitcoin chain. (coinfox.info)
That's mostly due to the fact that when the original bitcoin chain split into two, it created a lot of «free» bitcoin cash. (sebfor.com)
New Difficulty Adjustment Algorithm (DAA)-- Responsive proof - of - work difficulty adjustment allows miners to migrate from the legacy bitcoin chain as desired, while providing protection against hashrate fluctuations. (blog.zebpay.com)