Hi,
This plugin is lack of some features which are needed to most shop owners.

1. There is no actual page to compare. It creates a virtual page. There is no page ID. Thus We can't exclude it from being cached.
2. There is no shortcode : We can't put compare to regular pages and eclude it from being cached.
3. There is no check if product added before : Also cache creates another problem for non logged in visitors. Plugin doesn't check if same product added before. It just shows double of some products.

PS: There is no category for products compare plugin here :)