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Hi! Thank you for your interest in our asset! :) Just to make sure it's clear: GetItemXXX is called for each item in your dataset each time you call ChangeItemCountTo(int). XXX is Width if using a horizontal scroll view. Height, else. Ok, now I think I know what your case is. You're calling ChangeItemCountTo(totalItems), even if you didn't already have all of the items loaded in memory (from a server/disk) and when the optimizer asks you about the size of an item, you can't know which is it. Two ways of solving this: A) use a placeholder view with fixed size (a view that acts like a progress bar/spinning wheel or just says "Item still downloading...") and just return that size in GetItemXXX(). For simplicity, you can have a hidden "loading" text in each view and when that view should become visible (i.e. you receive an InitOrUpdateItemViewHolder(BaseItemViewsHolder) callback with BaseItemViewsHolder.itemIndex being the index of that item relative to the value you passed in ChangeItemCountTo(int) ), just enable that text and disable the regular content. call ChangeItemCountTo(int) to refresh the views when an item's size changes (but make sure that you're not calling it very frequently, like each frame). Or maybe you prefer option B): B) Call ChangeItemCountTo(NUMBER_OF_ACTUALLY_AVAILABLE_ITEMS) each time you get new items, until you have all of the items. Or, if the models you use occupy a lot of memory and you can only have some of them available at a time, still call ChangeItemCountTo() with whatever count you actually have ready. "ChangeItemCountTo" basically does a "refresh". It doesn't care if the count actually changed or not. Just make sure to not call it very frequently (like each frame). For example, if you fetch the items one by one from the network, you can call "ChangeItemCountTo" each time you have fetched x items, not for each of them. you must determine x depending on your case (of course it's acceptable to have x=1 if one item takes more than 1-2 seconds to download) I hope I was of help :) If you feel like there's more to talk about, meet us here: https://forum.unity3d.com/threads/simple-optimized-scrollview-scrollrect-available-on-assetstore.395224/ Best!