k4king ok thinking wine talks to serial ports basically the same no matter if they are usb or real serial ports. Wonder if that painfully slow is the sign of problem. This could all be the pure voodoo of kernel internal locking k4king. Ie doing X alone does not cause problems but doing X + Y hello gremlins. http://blog.fenrus.org/?p=5 Running this that is in 2.6.32 kernel to come out would be useful to get some idea where the wall it running into is. Also 2.6.32 removes file-system locking that blocks all devices using a particular lock while file-system is being written to and those devices block file-system ability to write. USB serial don't have that lock. Could be a operational clash. I know 2.6.32 is not a stable kernel yet. Lack of timechart makes tracing down this problems hard.