Pinescript Custom Performance Boost

This small script is a custom function that works similarly to the built-in calc_bars_count and max_bars_back functions, but can be used far more flexibly and significantly reduces the required computation time of Pine Script scripts.

The advantages over calc_bars_count are substantial.
The standard function works with a fixed value, e.g. calc_bars_count = 20000. The custom function, on the other hand, works on a percentage basis, e.g. with 20% of the total available chart bars.
In addition, calc_bars_count always affects the entire code, while the custom function can be applied selectively to specific parts of the script.
These two differences enable a much more flexible and efficient usage.

Fixed number of bars vs. percentage-based limitation:
The number of available bars varies greatly, not only depending on the ticker and timeframe used, but also on the TradingView subscription (approx. 5,000–40,000 historical bars).
For example, when using calc_bars_count = 20000, only charts that have more than 20,000 candles benefit. If the available number of bars is lower, there is no performance benefit at all until the value is changed after the first slow calculation.
When using the custom function with, for example, 50%, only 50% of the available bars are always calculated, regardless of how many bars are available. This results in a performance gain with shorter calculation times regardless of the chart.

Entire code vs. partial code sections:
calc_bars_count = 20000 affects the entire code globally, meaning the script processes data from only those 20,000 bars.
The custom function, however, can be used selectively for specific sections of the code. This makes it possible to continue accessing certain values across all available bars, while limiting only the truly computation-intensive parts of the script to a percentage-based range.
In this way, computation time can be drastically reduced without restricting the overall size of the data sets.
It is also possible to imitate max_bars_back and selectively limit specific values instead of limiting all of them.

I hope this is useful to some of you. Have fun with it!