I have a gen 2 hds 8&10 linked together and am having a problem. When I'm using structure scan, the scroll speed of the screen is extremely slow and does not keep up with the speed of the boat, meaning that images don't appear in my screen until I am way past the area where the image was shot. I know you can control the scroll speed of the sonar, but is there any way to control the scroll speed of the structures can?

I don't think their is on a Lowrance. I believe you have to keep your boat speed around 3 MPH

Is your depth showing up? I occasionally have situations where I have to force a depth (take it off auto) for what I assume is the software to re-synch with the Ping. Once that happens I am fine at any speed where my LSS transducer is in the water (below plane speeds). According to Lowrance they are capable of imaging up to 50 or so mph if the transducer were properly placed for those speeds.