You may get the following error in TradeStation when using the MQ MZT indicator.
This is a warning from TradeStation that too many text objects have been added to a chart. In TradeStation, if too many text objects are added, it can slow some charts. MQ MZT in TradeStation draws Fast Line and Slow Line Zero Touches as up and down arrows, which are added to the chart as text objects, since TradeStation doesn’t offer arrows as symbols like other platforms do.
To avoid this error, you must keep the history of your charts low enough so that less than 5000 arrows (and other text objects) are added to the chart. So, reducing the history of the chart should resolve this error. You can reduce your chart history using Format/Symbol and under the Settings tab, adjust the Range settings, as highlighted here in red. e.g., you could reduce the number of days back, or bars back, etc.