Generate reports dynamically

Dynamically Generate tables
Generate a table dynamically, where a column of a table is the result of a function, and the number of table rows is indeterminate. If it is implemented with a for loop, it will take a lot of time to invoke the function every time, is there any good way? Maybe the description is not very clear

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The adjustment of the function of the number of times seems to be saved, first calculated, put a number of groups, and then splicing into a table, too much on the page, once only a few of this page on the line
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Data is decoupled from the view layer. Slowly toss ~
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function calls, which are displayed with pagination if you are not sure

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