High CPU usage when playing GIFs

I am displaying GIFs in a RecyclerView. Code:

Glide.with(acitivity)
  .load(url)
  .placeholder(R.drawable.image_placeholder)
  .diskCacheStrategy(DiskCacheStrategy.SOURCE)
  .listener(listener)
  .into(viewHolder.imageView);

If I keep the Fragment containing this RecyclerView open, very high amount of CPU (~40%) is used by the app. And the phone heats up if I use the Fragment for 1-2 minutes. Is it normal for GIFs? Am I doing anything wrong here?