I\'ve been tinkering around with the BLE (Bluetooth Low Energy) connectivity classes quiet a bit lately and haven\'t been able to make it transfer data any faster than 1KB /
see at the guidlines of apple and you will see that a connection update request is required to speed up your connection.
https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf
I have min=20ms max 40 ms
I hope I could help
Roman