Ui Freezing when too many items are loaded in the list-LazyLoading feature request

[RileyManda]

I am facing an issue where my Ui freezes when i have more than 10 items in my list: I have a color generator that generates colors efficiently and never regenerates a color for the same list item saved in a map for my list. I tried removing this generator to test if the UI would stop freezing: but the UI still freezes when using grouped listview. I removed grouped listview and created a normal flutter listview. build and the Ui stopped freezing. I even tried creating separate widgets for my Ui and Data (Separation of Concerns)But all my lists that use grouped listview cause the Ui to freeze.:

This is my code snippet with GroupedListView:

return GroupedListView(
              controller: _scrollController,
              semanticChildCount: itemList.length,
              sort: true,
              order: GroupedListOrder.ASC,
              elements: itemList,
              useStickyGroupSeparators: true,
              groupBy: (Pantry pantry) => pantry.category,

              groupHeaderBuilder: (Pantry pantry) => Padding(
                padding: const EdgeInsets.all(10.0).copyWith(left: 20),
                child: Text(
                  getFormattedDate(pantry.date).toUpperCase(),
                  style: const TextStyle(
                    fontSize: 16,
                    fontWeight: FontWeight.bold,
                    color: Colors.grey,
                  ),
                ),
              ),
              itemBuilder: (context, Pantry pantry) {
                return Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 8),
                  child: InkWell(
                    onTap: () {
                      textController.text = pantry.text;
                      categoryController.text = pantry.category;
                      time = pantry.time;
                      showItemInput(context, pantry: pantry);
                    },
                    child: Container(
                      decoration: BoxDecoration(
                        color: Colors.white,
                        border: Border(
                            right: BorderSide(
                          color: getCatColorForCategory(pantry.category),
                          width: 10,
                        )),

Suggestions
Please implement lazy loading to the grouped listview library