This composer-plugin contains set of improvements that makes running composer update on your Drupal project significantly faster.

composer require zaporylie/composer-drupal-optimizations:^1.0

• Reduce memory usage and CPU usage by removing legacy symfony tags (see also symfony/flex#378)

(only one at the moment)

Following numbers are for clean https://github.com/drupal-composer/drupal-project/ without and with this plugin.

Before:

Memory usage: 304.16MB (peak: 876.79MB), time: 17.13s

After:

Memory usage: 218.72MB (peak: 250.44MB), time: 4.83s

• Symfony community - idea and development; Special thanks to @nicolas-grekas
• Jakub Piasecki - port and maintenance