Wonderm00n

The WordPress default galleries always link to the full image size which can be pretty annyoing because most users upload huge pictures.
With this plugin you can set a default size for the galleries to link to. This can be thumbnail, medium, large or full.
For now this a global setting for all galleries, but on a future version I plan to let you choose a specific size for each gallery you create on your WordPress posts or pages.
It’s also possible to add arguments to the link (A) tag. This may be useful to add lightbox/fancybox script compatibility.
Based on the oikos.org.uk solution that can be found at http://oikos.org.uk/2011/09/tech-notes-using-resized-images-in-wordpress-galleries-and-lightboxes/

Wonderm00n's Gallery Link Size Changer

This plugin allows to change the way the Wordpress gallery links. You can select to…

Bruno Cantuaria

Most users like to upload their fresh shotted pictures to WordPress directly from their digital camera, and what happens? Full disk, reach bandwith limit and slowdown the site with heavy images.
Limit Image Size is a smart plugin wich will limit the megapixel an image can have. When you upload an image, plugin will check if it have more megapixels than you limited, if so, the plugin will automatically resize the image to have that megapixel. This will save space in disk, site’s bandwith and will make your site faster.
Limit Image Size works with 3 methods to resize, not all of them will be enabled on your site but the plugin will choose the best one available for you. The 3 methods are:
<ul>
<li>ImageMagick – The best method with the best performance, but requires that your host have installed the ImageMagick extension on your server.</li>
<li>WebService – This method sends a copy of your image to a webservice which will resize it and sends it back to your site. It’s not the fastest way but is a good one for limited sites.</li>
<li>GD – This method is native to PHP but demands a lot of processing from your server. The plugin will use it only if no other method is available.</li>
</ul>
So, there is no cons to Limit Image Size. Just install it and you will never more need to care about the size of your pictures.

Limit Image Size

Limit Image Size will save space in disk and bandwith resizing large images when you upload them to WordPress.

Wonderm00n's Gallery Link Size Changer vs Limit Image Size