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What's wrong with flooding the buffer? (they are allocated for each connection) TCPIP connections block when the buffer is full (that's why there is a timeout on the write). If you set the buffer to, say, 10 x message size then it will fill up with 10 messages and wait until at least one has been received (nak'd) and then write another.

Don't forget .NET calls in LabVIEW are extremely slow compared to DLL calls, something to do with the managed memory aspect. I seem to remember even simple calls taking several ms to return.

Ohhh! This is a different issue all together. You don't have a Waveform Graph, you have XY graph. A Waveform graph has every sample be the same distance apart, where XY it is arbitrary. Attached is an updated version where we write three channels, one for the X one for Array 1 and one for Array 2. Then when we read we read all values from all three channels, then build them back into a bundle of X and Y values. I also built that into an array so one XY Graph can show both plots but you may want that on separate plots. TDMS Waveform Example 2.vi