Hi,
I'm not sure I completely follow your issue, the value is for meta keys per call not "events/sessions" if there's no value being read from the config file for some reason the code actually defaults to 500k meta pieces per call so at 25,000 events it would be an average of 20 keys per event which if you only have 20 keys select would be about right. You should be able to increase that value to close to about 1.5M more than that the REST endpoint wouldn't really be able to handle.
That aside, I don't think the app will ever cope with the rates you are describing of 35,000k EPS can you give me a bit more background on what you are trying to do? Please feel free to contact me directly via the e-mail on the app files.
Hope this helps!
Thank you,
Rui
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