You cannot make the ADS1115 sample any faster than 860Hz. This is a hardware limitation and has nothing to do with the drivers or libraries.
With all due respect, you did not read my last post carefully. As I said before, "other sensors" beyond ADS1115 may not be limited to 860hz. Right now, rouse217
found that the R-Pi & library sample at ~110hz - that's worse than your cheapest Arduino. rouse217
also found enhancements to the library that may increase the sampling rate. I'm just asking if you may verify those findings and update your library for the benefit of your customers. Thank you.