Why does my site load slow first time and fast subsequent time?

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I noticed whenever there’s a long period I don’t access my site, when I initially fire it from my browser, it takes very long to load.

But once it loaded, subsequent visits from the same device became fast again.

I think it’s something to do with caching but I need specific advice and why this is happening and on how to drastically improve the initial load time.

Thanks!

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