Add cache key to guest links block.
Add compare sidebar cache key info.
Add block cache to product viewed.
Remove incorrectly copied code.
Add block cache to recently compared.
Add block cache to product view description.
Add product view attributes cache key.
Add block cache to product media block.
Correct item collection call in block cache
Add block cache to product tags.
Add block cache to upsell product block.
Add block cache to review summary.