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Serial performance problem



Hi,
I developed an application under OSX 10.4 with XCode 2 named Reader.
The program executes a read from an external component through a serial communication channel, so I started from the SerialPortSample (http://developer.apple.com/samplecode/SerialPortSample/index.html) and everything works fine.
After the deployment of the new Leopard I ported the application under XCode 3 to work with the new 10.5. I used the same pc and nothing has been changed about the serial communication.
With the Leopard the reading process of the "Reader.app" is very slow but if I run the "Reader" file that is contained into the "Reader.app" things are faster.
How can I solve the performance problem with the "Reader.app" file?

Thanks in advance.
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