I have six cameras and I have the DS Cam for my Andiroid phone. Motorola Milestone X.
The six cameras come up on the phone no problem. I get 1 frame per second frame rate when viewing all six cameras on the all cam screen.
I get 4 fps when viewing one camera.
When trying to scroll side to side, I find that three or four swipes across the android phone send a pretty good signal.
Also, when I'm in the foscam setup on the administration tab, then on the PTZ settings, the speed of ZERO makes the camera really pan and tilt very quickly. Very fast. That way, the signal from my android phone gives a quick signal, and the speed is fast for the Pan and Tilt, so I get the best combination of speed and response with that. It is still mediocre, but much better than no pan or tilt at all.
One is home NAS storage with RAID 1 and two 1.5tb seagate drives.
One is work NAS Surveillance with 6 FOSCAM F18918W cameras.