OAD slow from OSX

Hi all,

Having some problems with performing OAD from an OSX application. We have it working with the sample iOS code from TI (only modified to port to OSX). 

In our image A we have the following connection parameters defined:

/********* fast connection ********/

// Minimum connection interval (units of 1.25ms, 80=100ms) if automatic parameter update request is enabled
#define DEFAULT_FAST_DESIRED_MIN_CONN_INTERVAL 80

// Maximum connection interval (units of 1.25ms, 100=124ms) if automatic parameter update request is enabled
#define DEFAULT_FAST_DESIRED_MAX_CONN_INTERVAL 100

We realize that these should be much faster for future releases.

And when the mac connects to image A we get several connection updates which finally result in the last one as shown below:

So it looks like we settle on a connection interval of 123.75ms, which is slow but shouldn't be agonizingly slow.

However once we start transferring the data we aren't using anywhere near the 123.75ms interval when sending:

Its using closer to ~618ms (which looks like the latency + the interval). This means our OAD is taking around 22 minutes instead of the expected ~5-6 mins.

Does anyone have any idea how to make OSX max out the connection interval? or how to speed it up at all?

I have attached a full log from PacketLogger below if anyone needs more information.

Thanks