Gallery 2 embedded in Drupal can make a good combination. When you combine two of the best open source software packages together you end up with a versatile gallery/CMS combination.

As your site grows you may however experience some issues with server load and start to look at caching to reduce server load. Both Gallery 2 and Drupal can be configured from their respective admin interfaces to achieve this.

Gallery 2 claims around a 90% increase in performance with Full Acceleration and a 10%-25% performance increase with Partial Acceleration. There is of course a tradeoff with some of the dynamic data not updating until the cache expires.