serial port issues with 10.8?

    Jun 18 2013 | 8:21 pm
    Hello all,
    My patch utilizes the serial object to communicate with an external device. The patch was developed on OS 10.6.8 and Max 6.0.4 and it works very well there. On a much faster OS 10.8 Mac Mini it's garbage. The message/ack cycle has gotten very slow and inconsistent rendering my patch useless. It's the same Max version, same serial drivers, no 3rd party objects.
    Normally I send messages with a 33ms metro, the device responds with an ACK very quickly, and the next message goes out 33ms later without a glitch. On 10.8, it's randomly anywhere between 33ms and 150ms, obviously choking hard on something.
    I just updated everything, latest keyspan drivers for 10.8, latest Max6.1, and there is no change.
    Anybody have a similar experience?