https://www.mql5.com/en/code/7936. Thats about as simple as it gets.
I assume you mean "script" and not "indicator".
I think the default period converter script has to be manually unloaded from the chart when it has finished, doesn't it? I think you have to check the experts tab to see when it is complete, and then remove the script yourself (from what I remember).
It should complete the conversion relatively quickly (< 1 min), even for several years worth of data. If it is draining resources, then perhaps you haven't seen the notification it makes in the experts tab to tell you it has finished (easily missed), and unloaded it manually.
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Can anyone write a new period converter indicator that is usable? All this ones either drain the computer or they are for monthly periods.