I installed the full package of Gallery2 last monday and got all the modules activated. I found out that my gallery was very very very slow 
Today, I have disabled and deleted some unnecessary modules out of my gallery and it loads a lot faster than before. If you downloaded the full package, you don’t need all the modules in there. Make sure you only upload the necessary modules.
For me, I only use the following modules which I think necessary for my gallery:
- Captcha - can help to prevent spam comments by bots.
- URL Rewrite - usefull for friendly url for search engine, but only works with Apache.
- Gd graphic toolkit - on the fly photo manipulation
- Image Block - to show random, most viewed, or most recent photo outside your gallery.
- Sitemap - can help to create sitemap for Google crawlers.
- Comments - to give visitors the ability to post comments on albums or photos.
You can also enable some additional modules like ImageFrame, Slideshow & Watermark to add more feature into your gallery.
masih dibatam om
masih donk