Why are some Bitcoind commands comparatively slow?

Why are some Bitcoind commands comparatively slow?

For example, running bitcoin-cli getbalance <address> on an arbitrary, watch-only address takes around 6-7 seconds for a response. Is there any way to improve this?

How do API services like Blockchain return balance details almost instantaneously? Each API call to Blockchain takes less than half a second for a balance request. Is there a way for me to do that?

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