Each time a custom function is used in a spreadsheet, Google Sheets makes aseparate call to the Apps Script server. If your spreadsheet contains dozens (orhundreds, or thousands!) of custom function calls, this process can be quiteslow.
Each time a custom function is used in a spreadsheet, Google Sheets makes aseparate call to the Apps Script server. If your spreadsheet contains dozens (orhundreds, or thousands!) of custom function calls, this process can be quiteslow.