Hey Luc, there are some other refresh periods in one of the two dropdown boxes at the top of the page. The way it works at the moment is that whatever lookback period you select, it will refresh after that period of time and then look back that many minutes to check for changes. So for example if you choose a lookback period of 10 minutes, it will look at the last 10 minutes of data for each symbol, compare that against the change threshold field, and display each symbol that has changed more than that amount in the last 10 minutes, then wait 10 minutes and do that again.

The shortest refresh period at the moment is 1 minute - I can definitely make that shorter but the question is how far back should it look for data? If it refreshes every 5 seconds but only looks at the last 5 seconds of data, it's unlikely that any symbols will have changed more than 5% in 5 seconds. Perhaps we should have two fields, one for the refresh interval and one for the lookback period. What are your thoughts on that?