ARIA Rule: configuration option to enable/disable Accessibility optimization for the grid
You can use the “Enhanced accessibility option”, if you wish to optimize SuperTables for accessibility. It in general disables the column and row virtualization. Which in results generates all cells in the DOM thereby you will see considerable reduction in performance.  There may be 2 scenarios when you may wish to disable column virtualization (if you prefer).
1) Auto-sizing of all columns. This will ensure that all columns, and not just the columns which are rendered on the screen, will be resized.
2) Support for a11y. This is to prevent any potential issues for keyboard navigation and screen readers (https://www.a11yproject.com/).
Check the Product Guide for more information.