Hey Mike,
When comparing PingPlotter results to the results from another tool - the first (and biggest) thing you want to make sure of is that you're tracing to the same location. I'm not sure what speed test tool you're using here - but you'll want to see which IP its pinging (if it tells you) - and make sure that's the same IP address you're tracing to in PingPlotter.
Past that - there are several different things that could be a culprit in the discrepancy you're seeing here. We've actually got an article that goes over some possibilities on this front (note: the article pertains to difference in packet loss between PingPlotter and a command line ping - but a lot of the information still applies to this situation as well). Have a look here:
http://www.pingman.com/kb/37If this leaves you with any questions - feel free to send us over some of your PingPlotter results ("File" -> "Save Sample Set"), with some screenshots of what you're seeing in the speed test tool - and we'd be happy to look into this further!
Best wishes,
-Gary
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