Series of jpg. NCS is primarily designed for handling videos. There are some possibilities to experiment with. Right Click on a camera and go to Configure features and you have timelaps. This is to continuously take a picture with a certain interval. Another way might be to set a Rule for a camera when Motionstart the timelaps start and when motionFinished the timelaps also ends. There you should be able to get jpg. When you look in the Library only the first jpg will be seen. The rest of the jpg pictures can be found in the folder.
For FPS there are several parameters to look for. Usually, we look at the bottom right of the video like
That number is what the camera delivers to NCS. In my case the camera delivers 18 FPS. It is set up in NCS to deliver 25 FPS, but it is on wifi which makes it slowe and varying.
This is valid in Single view. If you view the camera in multi view with other cameras it is by default set up to view in 10 FPS as in my settings above.
The recorded FPS. The recorded FPS is set here
To see the recorded FPS you must do this. Play a recorded video in VLC. Go to Tools and Codec information like this
There you can see the Recorded Frame rate which here is 20. Down to the right on the video you see 30 FPS which is what the camera delivers to NCS in the Live situation when the video is recorded. You can change the recorded fps in the settings and test.
So why do you only see 8 FPS on the bottom right. Well, what is that number when MD is off? Is that number higher? If it goes down when you are running NCS in MD for both cams I would take a look at the CPU load of the computer in the Task Manager. You mentioned HD cams and if you want high FPS it uses a lot of CPU. So take a look at that. The settings are one thing, but the final result will depend on what the communication link between camera and computer LAN/wifi/... can deliver and also the capacity of the computer.