Screenshot preview freezes a game for a few seconds

I have a screenshot preview at the end of the level, but when I show it my game freezes for a bit(low fps for a few seconds). This is code I use to load screenshot and crop it(for a little preview sample). Please, help me to solve this lag issue

 private IEnumerator ShowScreeshotPreview()
 {
     yield return 0;
 
     screenshotTexture = new Texture2D(2, 2);
     byte[] fileData = File.ReadAllBytes(destination);
     yield return 0;
 
     screenshotTexture.LoadImage(fileData);
     yield return 0;
 
     Rect croppedSpriteRect = new Rect();
     croppedSpriteRect.height = screenshotTexture.height;
     croppedSpriteRect.width = screenshotTexture.height;
     croppedSpriteRect.y = 0;
     croppedSpriteRect.x = 0;
 
     croppedTexture = new Texture2D((int)croppedSpriteRect.width, (int)croppedSpriteRect.height);
     yield return 0;
 
     croppedTexture.SetPixels(screenshotTexture.GetPixels((int)croppedSpriteRect.x, (int)croppedSpriteRect.y, (int)croppedSpriteRect.width, (int)croppedSpriteRect.height));
     yield return 0;
 
     croppedTexture.Apply(); // Memory leak occurs here
     yield return 0;
 
     screenshotPrview.mainTexture = croppedTexture;
     yield return 0;
 
     ScreenshotPreviewAnimator.SetBool("visible", true);
     screenshotLoaded = true;
 }