It’s a common requirement to display large data sets in the C1FlexGrid control. The most common technique to handle large data sets in UWP is called UI virtualization. With UI virtualization, items are not generated until they are brought into view. This means that only the number of cells visible in a viewport (size of window or client area) will be generated. By default, the C1FlexGrid control supports UI virtualization for both vertical and horizontal scrolling.
C1FlexGrid also takes advantage of container recycling for cell templates, which optimizes scrolling performance by reusing cell elements that are scrolled out of view, rather than destroying them. It’s important to note that custom cell templates support container recycling but cell factories do not. To improve performance with custom cells, consider using cell templates with simplified bindings and converters rather than cell factories. You can find more information in the following topics:
You get UI virtualization and cell template recycling for free, out of the box, without having to do any extra work with C1FlexGrid. If that's not enough to improve performance you can also consider Incremental Template Uploading:
