What techniques can increase the performance of RecyclerView?

To improve RecyclerView performance, the following techniques can be used:

• ViewHolder Pattern — already built into RecyclerView, minimizes calls to findViewById.
• Using DiffUtil — for efficient data updates without redrawing the entire list.
• Optimizing item layouts — avoid deep nesting and heavy components.
• Using setHasFixedSize(true) if the size of RecyclerView does not change, to enhance performance.
• Loading images asynchronously with libraries (Glide, Picasso) and caching.
• Pagination — load data in parts to avoid keeping the entire list in memory.

Example of using DiffUtil:

val diffCallback = object : DiffUtil.Callback() {
    override fun getOldListSize() = oldList.size
    override fun getNewListSize() = newList.size
    override fun areItemsTheSame(oldPos: Int, newPos: Int) =
        oldList[oldPos].id == newList[newPos].id
    override fun areContentsTheSame(oldPos: Int, newPos: Int) =
        oldList[oldPos] == newList[newPos]
}
val diffResult = DiffUtil.calculateDiff(diffCallback)
diffResult.dispatchUpdatesTo(adapter)