RecyclerView laggy scrolling

Question

I am loading 400x200 images in RecyclerView, but scrolling is laggy on 2k devices. I am using Picasso for loading images from resource.

As you can see in the demo ima

Answer 1

In my case, bitmap creation was making delay for scroll. So I put bitmap creation in background thread and set to image in UI thread. This way, UI is not blocked for bitmap creation

new Thread(new Runnable() {
                    @Override
                    public void run() {
                        Bitmap myBitmap = BitmapFactory.decodeFile(filepath);
                        activity.runOnUiThread(new Runnable() {
                            public void run() {
                                vItem.imgProfile.setImageBitmap(myBitmap);
           
                            }
                        });
                    }
                }).start();