It's perfectly fine Etalla...
In truth I'm not sure that it is or isn't... I haven't read through the entire version change list as yet nor have I actually had the time to get into what's changed in the use of the Gallery as yet.
Currently we're going to deal with the slow down issue first, then turn to the new version of the Gallery and work that out...
As an aside, here's the list of changes. I highlighted the one that I think you're looking for Etalla:
+Added moderation logging to log key actions made by gallery admins in the gallery along with a Moderation Log area
+Added alt tags on image listing areas in the gallery using the title of the image
+Youtube external videos now pull in an image from youtube for the video preview image
+Custom Fields can now be added globally instead of just category level specific
+Custom Fields can now be edited
+Individual User Folder Custom Permissions
+New sharing options added for Reddit and Pinterest
+Now inserts keywords into SMF Tags if you have the smf tagging system installed on topic posting
+Updated top userbar tabs in the gallery code optimized
+Unapproved comments now visible to admins/comment owners when viewing a picture/video
+Added index to date column on gallery_pic table for better performance when date searching
!Fixed bug with uploading videos failing if no preview picture included.
+Video Addon now built into SMF Gallery Pro -
Upload formats supported: avi,flv,mov,mpg,ram,rm,rpm,swf,wmv
Supports YouTube and some other common embed video sites.
Can have a user uploaded thumbnail if none is specified uses generic video image
Settings to set the max file size, player height, player width, show download link, show html linking codes
Membergroup/category level permission to control which group can upload videos.
+Not filling in all the information/errors on add picture/add video page no redirects back to the page with information already filled out instead of a fatal error. SMF 2.0 only.
+Added user information to the myimages page. Stats include total pictures,comments and views total
+Added setting to redirect back to the category instead of the users myimages page by default
!Admin email notifications/tweet clean up single quote display
+Some linktree tweaks in a couple places display/style improvement
+Template/style tweaks throughout the gallery.
+Added Auto Tweeting main category setting for items posted in a category
+New image effects system. Effects including the following: Blemish, Brightness, Contrast, Crop, Draw, Effects, Enhance, Orientation, Redeye, Resize, Saturation, Sharpness, Stickers, Text, Warmth, White
+Added setting to create a default personal category gallery for a user the first time they visit the gallery
+Added notification system for gallery admins on pictures waiting approval, comments waiting approval, reported comments and pictures.
+Added checkboxes for gallery admins on image listing page to do bulk operations such as delete, unapprove, move images.
+Total Favorites and who favorited added to the view picture/media page if you have the favorite system enabled
+Added member group color links to many areas of the gallery
+Added gallery navigation bar/tabs to report picture, report comment, view ratings, and view viewers pages
+Added Facebook Like Button as a sharing option on the view picture page
+Added option to search exif make and model
+Added new setting on add/edit category to post to a specific topic when enabling the autopost features for a main category
+New setting to count member comments as posts
+Alternate table row styles in different sections of the admin area to make it easier to read
+Added checkbox approve/delete comments on the approve comments page
+Updated html markup style to improve display for SMF 2.0
+Better Copyright Removal upgrade system
!Fixed paging sorting on the user gallery list page
Tera