Reading a few excel rows takes so much time

Greetings,

I’ve run against an issue where the reading operation takes so much time even though the excel file contains only a few rows. I’m building a Photoshop project or in other words, a Photoshop script but it seems Photoshop gets frozen/stuck forever whenever it tries to read the file. I’m using the demo stated on the main page.

#include "./xlsx.extendscript.js"

var workbook = XLSX.readFile('whateverpath');
var first_sheet_name = workbook.SheetNames[0];
var first_worksheet = workbook.Sheets[first_sheet_name];
var data = XLSX.utils.sheet_to_json(first_worksheet, {header:1});

$.writeln(data)

Excel file: TestInput.xlsx

Any clue?

[A1rPun]

You have to pay for ‘performance enhancements’.

[reviewher]

ExtendScript just can’t handle large arrays or large strings. Try:

var out = [1,2,3,4,5,6];
for(var i = 0; i < 700000; ++i) {
    out[i+6] = out[i];
    if((i % 1000) == 0) $.writeln(i);
}

Even after setting $.memCache = 1024*1024*1024*2 ExtendScript slows down after 100K and basically stops after 250K.