The program is excellent, but could the graphing be at 10 sec intervals?
Not really at present, unfortunately. Collecting each sample can take more than 10 seconds, depending on the number of items which are being monitored, and the capabilities of the PC it's running on.
I use a third party library for the telnet access, and I do plan to investigate the possibility of using a different library for greater speed when I can find the time. But at present, other things have a higher priority.
[Edit] Also, B*cat's comment about the stress on the modem/router is a valid point.