If I have a chart set to load 3 days, and its Monday, I will only get Mondays data. If I then set it to 4 days, now I am loading an extra day I normally do not need. Further, if it happens to be a holiday weekend then I have to load 5 days of data to guarantee that I'll have the previous trading sessions data.
If I were to configure things for a fix # of bars this can also be a performance problem for Instruments that do not have data for every minute of a trading day. For US instruments a 1 minute chart will have 390 candles for a normal market data. If it has low volume, it will have less than 390 bars. For some instruments this could result in more than 10 days loaded and can take a lot longer to load the chart.
Feature Request: For smaller time frames like tick, second and minute it would be extremely helpful to have # of sessions to load instead of # of day to load.
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