You shouldn't be setting this, but there are some condition where I can imagine it. What is your "Samples to include" set to? How many time graphs do you have showing?

It may help to take your current configuration and send it over to us (via the Help -> Email PingPlotter Support... menu) so we can have a look at it for possible performance problems.

We have customers running 100 targets+, so 4 shouldn't be a problem.

- Pete