Hi !
The "Browse Page" is very large. With all thumbs (which is the default loading) it has about 5 MB and the loading time is unacceptable long (even with a fast connection).
The thumbs are too big (picture size and file size).
Try to use a standard size and use for example 12cropImage addon to define the section of the pic that you want to show in your thumb (sometimes the thumbs in your gallery are a bit unexact).
The last thing I would do, is limiting the total number of thumbs per page.
I'm a beginner in Pixelpost ... sorry for these trivial tips, but that's the way I would start.
;-)
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