One collection vs multiple collections and sitespeed

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1

A quick and, I guess, a relatively simple (noob?) question:

Is it wiser to use one big collection or use multiple collections with regard to site loading speeds? I am talking about one large collection or three/four smaller ones (with more datasets). Does this have effect?

Thanks for

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If you use more collections and get data from each of them one by one site load will be slower. Because you will make more requests instead of single request. But sometimes you must/should use multiple collections.

Instead of making requests to each collection you can connect them each other and make a request to one of them so you can have more organized database and faster load speed.