Speed up Magento2 DI compilation
This module caches file lists during compilation to avoid expensive filesystem scans. Speed improvement is about 40% to 50%.
composer require eleanorsoft/module-di-compilephp bin\magento setup:upgradephp bin\magento setup:di:compile
After compilation, you should see a folder var\di_cache with 4 (or more) files. This is the actual cache. From now your compilation process will use these cached lists instead of scanning the whole filesystem.
Note 1: these caches contain only core files. All custom modules will be scanned each time as usual.
Note 2: if you upgrade Magento 2, delete these files because core modules could change during the upgrade.
See details in the article "Speed Up Magento 2 DI Compilation (“setup:di:compile”)"