You are running composer with xdebug enabled. This has a major impact on runtime performance.対策 - Qiita

新しい記事「[必要な時にのみxdebugをオン](http://qiita.com/koriym/items/29f81514706a39e3b7c1)」を投稿しました(2017/05/19) --- > Composer 1....