When uploading images to WordPress it will save time and resources if you optimize all your files before uploading.
For Mac Users it is recommended that you download the following free applications
This app allows you to batch resize images by simply dragging and dropping photos onto the application.
This app does what the name implies which is modifying your file names. This can be useful when dealing with a lot of photos / galleries so you have a logical name versus the auto generated one from the camera.
Video tutorials for both of these added to Blog Central in the future