Implemented Varnish Caching with configurable ESI holepunching and customer segmentation for quotes wishlist etc.
Rewritten Magento Indexers to use the indexes optimal and implemented table rotation. Also optimized the queries.
Implemented Core fixes for EAV Cache. Also the Varien_Db_Select is extended to gave index hints and also have full controll over the query cache of mysql. Also implemented a generic cacheable Product Block and Block for Product listing. As a feature there the price is holepunched with a different block so we can use the same product block cache for different customer groups.