Webpro Company blog: Why does Drupal get slower over time?

Many Drupal sites are fast when launched, but become heavier over the years. The cause is usually not Drupal itself, but how the platform is maintained, extended and filled with content over time. Slowness rarely comes from one change A Drupal site does not usually become slow overnight. It is usually a gradual process: more content is added; more images and files are uploaded; new modules are ins