We've received a few recent reports of export speed being slow when exporting raw data to a csv file. Unfortunately, exporting to a csv file has its limits, and the time it takes to process the data depends on the following:
Number of digital transitions in your data
Number of analog samples in your data
Your PC specifications
We might be able to squeeze out a bit more performance in terms of speed, though due to the csv file format itself, the speed increase may be in the order of a few 10s of percent. We wouldn't be able to drastically increase the speed by 10x.
Besides the csv format being quite inefficient, one area that might be causing a bottleneck in speed is the target location for the export file. For example, saving to a network drive or an external usb drive will cause limitations in export speed.
An alternative approach (much faster and produces a smaller file) would be to export to a binary file. More details on the binary file format can be found in the link below.