Getting all Incident Threads in one call via REST?

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Hi all, 
we are building a separate webpage where we want to show incident details on an external webpage. While we have built this before using SOAP, we are using the REST API now. One of the things we run into is this: 
With a SOAP request, it was possible to get all incident threads in 1 soap call. 

With the REST API there does not seem to be a way to do this in 1 call. So what we need to do to show the threads is a lot of calls to the API, which causes delay in loading the page.