Hi All,
If anyone's interested, I've posted a blog on how to implement full page caching in nopCommerce (4.2) without modifying any core code. This can greatly enhance the performance of busier pages under load, like category, product details, etc.
Check it out and let us know what you think!
http://www.aperturelabs.biz/blog/simple-full-page-caching-in-nopcommerce/