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Can the connection parameters be updated by the central during a connection?

I'm trying to understand latency between simple events (like a button press) and transmissions to show that event on the nRF Toolbox iOS app. In some trials, my updates are nearly instant. In other trials, with the same firmware, it can take ~3-5s to see the update on the iOS device.

Can my connection parameters be dynamically updated by the central (iOS device) depending on the frequency of events?

My connection parameters adhere to Section 3.6 of the Apple guidelines:

#define MIN_CONN_INTERVAL                   (MSEC_TO_UNITS(50, UNIT_1_25_MS))
#define MAX_CONN_INTERVAL                   (MSEC_TO_UNITS(100, UNIT_1_25_MS))
#define SLAVE_LATENCY                       (0)
#define CONN_SUP_TIMEOUT                    (MSEC_TO_UNITS(4000, UNIT_10_MS))

But I should also monitor what the actual connection parameters end up being after they're mandated back from the iOS device.

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