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Why OnChartEvent is more faster than OnTimer?

When I set something to do with OnTimer, setting 1 millisecond takes longer than if I call this function when reacting to an event. Why

What difference between close[] of OnCalculate and the Close[] of Predefined Variables?

Both do same action or any of them have a special thing like more performance

Bug in arrow indicators

Why most indicators that I put in graph stay with aleatory arrows when I alter symbol and change the timeframe in same window? Its any garbage that going accumulating in the buffers? Can you explain why it ocurrer? and what I can do to solve it? Thanks! Sample