The People's Bank of China in Beijing's financial district.

Hours after China unleashed a fresh bout of monetary stimulus in a fresh bid to stabilize the country's unruly equity market and quell concerns around an economic slowdown, investors are already looking for more aggressive action from authorities.

"The PBoC has come across hesitant and reactive. Policy easing has followed rather than pre-empted the pullback in the economy as well as asset markets," said Vishnu Varathan, senior economist at Mizuho Bank.