Thanks!
The cable finder led me to a usb 2.0 cable. Isn't usb 2.0 terribly slow?
I think it was a usb 2.0 cable that slowed my camera down so much that I had to stop shooting, disconnect, and continue the shoot untethered. After fifteen images I had to wait five minutes.
When shooting tethered, you need to capture to an internal drive, and that drive should be a SSD. Having anything else attached via USB can cause lots of issues, as you're looking at the bus being tied up. Tell us more about the computer you're shooting to. What other applications are running? How much RAM & free space do you have. In a perfect world, you would only have CaptureOne running, writing to a SSD drive (internal). Disable any anti-virus/security programs, Dropbox, really anything that may compete with CaptureOne from doing the job at hand. Do not use a USB hub, get a proper length cord, such as the tether tools. Things like USB extenders can cause their own issues.
Tell us about your shooting style, are you doing singe shots or bursts? Are you working handheld or from a tripod/copy stand?