i checked CNYUSD pair and i feel that there is ratio between china yuan and crypto currency . as we know China's company have key role in crypto market its usefully to consider this matter .
i think BTC/CNY pair is faster than BTC/USD.
if you interested, you can check below graph
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compare CNYUSD and BTCUSD | BTCUSD/CNYUSD and BTCUSD