Calling a Mx published rest is very slow

Hi all, I have a Mendix application with multiple published rest api's. A Qlik app imports the data. For all of the Rest Services, everything goes as planned, even for a rest with a lot of deep-nested objects. However, one of them (the simplest one, without any nested objects), has a lot of performance issues. At first I thought it was because a lot of objects (5.000.000) are sent. To fix this, I implemented pagination, with which only 200 objects are sent. When calling this api in Qlik, it still takes a looooonnng time to import the objects (about 2 minutes per page). It even already takes a long time to only connect to the rest service, whereas all other endpoints (with the same settings) have no issues at all.  Does anyone have an idea what could be wrong?
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