Today the new version of the Magento 2 was launched, with this release includes important performance enhancements, especially for operations that involve the category page as well as image resizing.
Magento 2.1.6 contains over 15 significant performance enhancements when compared to 2.1.5. Look for the following highlights in this release:
Improved performance of the Category page
loading configurable products from the database is now up to 5x faster
price calculations are now up to 3-5% faster
stock validation is now up to 20% faster
Optimized image resizing
image resize operations performed from the command line interface now generate images of all sizes. See magento catalog:images:resize for more information.
image resize operations from the Admin have been fixed
significant decrease in the number of file system operations when processing images on frontend
caching of image metadata is up to 50% faster, depending on store size
Improved performance of layered navigation
- layered navigation is now up to 3% faster due to the caching of attribute options
Minimized indexing operations after product import
There are some functional fixes and enhancements that were applied on these main points:
Catalog, Configurable products, Indexers, Import, Caches and Swatches.
You can check more details about on the official release notes.