How to optimize image loading?

Question

Image optimization

Hello! I connected yii2-images

to the project and set everything up. Everything seems to be working. But I can't figure out what the problem is. I make a selection of products by category and pass it to the view:

Product::find()->where(['category_id' => $category->id])->with('imageRico');

It seems I use "greedy" loading and all the same it does not help. The page loads, and only after a while the photos of the goods appear. What could be the reason?