This dialog provides settings related to the performance of RuleTrader:

• Enhance system performance by limiting price pre-load for statistics: By checking this option the backfill of price statistics and price-indicators is limited to just enough prices to completely fill the statistic or indicator that has the longest period. Unchecking this option means all price statistics and indicators are filled with the entire price history for a share, which is generally redundant and can slow system performance.
• Evaluate sell rules even if strategy is not selected: For trading strategies that are enabled or disabled according to some criteria, this ensures that even if the strategy is disabled it will continue to monitor the positions it has opened, so a sell signal can be raised if required. We recommend you leave this checked, otherwise all such positions will be unmonitored while the strategy is disabled, which could prove expensive
• Period between share-type scans __ calendar days: The ShareScope database is in a state of constant flux, to keep it up-to-date with changes in the markets it tracks. Every so often, RuleTrader scans the whole database to re-check the types of shares that are included in it. This setting determines the period between these scans.
• Purge overlay data-series if not required for __ or more calendar days: Chart and indicator panel overlays take up memory and disk space, as they often need to store values for every day they have operated. If an overlay has not been used (i.e. displayed) for this number of days, then its historical data series will be deleted.