Is maximum BLE data rate of 10Kb acheivable on the CC2540 ?

I wrote a sample application which uses writeNoResponse commnands of 20 bytes each to load the BLE stack to the maximum data rate.

I noticed that in a connection event of 4 Tx/Rx phases the Tx/Rx phase takes around 4 Milliseconds, and teh BLE stack prossessing takes another 5 milliseconds. 

I dont see how all the processing can be completed in a minimum connection interval of  7.5 milliseconds. ( And I even did not metion the "user" application processing....)

Has someone written an application that reaches the 10Kb data rate ?

Thanks.