You should select the 'resize' option when uploading images, if
you do not do this, then the original filesize is kept which can
take a long time to load.
After images are uploaded, they take a little longer to load the
first time
Solution:
You can reset your images to be 'resized' as follows:
* Login
-> Edit/Create Pages
-> Click on a gallery
Check the 'restore original' and 'resize image' boxes then submit
all changes.
This should then resize all the images to the correct size for
your web site.
If you continue to have problems, please tell us specifically
which image(s) and where we can find them so we can have a look
in more detail.