For example, if you're reading data with the wbgetentities endpoint, try to request the maximum number of IDs you are able to at a time.

If you’re adding data, avoid making repeated wbsetclaim requests; instead put all the claims you want to add in a single wbeditentity request.

I believe that this is supported by the Wikidata-Toolkit, although I'm no expert in it. In the examples, you can see how to batch together reading a list of properties rather than reading them one by one. (https://github.com/Wikidata/Wikidata-Toolkit-Examples/blob/master/src/examples/EditOnlineDataExample.java#L231) 

Cheers,

The Wikidata Team