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Install and activate User Meta Manager plugin. Go to Users -> User Meta Manager. Under your user click on Edit Meta. From pull down list of meta keys select edit_post_per_page and click Submit. Change the value to 10 and click on Update. All done.
Having so many images on one page isn't recommended. You should split the images into smaller galleries and across more than one page (or use pagination) to lower the page load speed for each page. To split a single post in several pages (adding pagination) you can just add using the text editor. Alternatively ensure you're image sizes are not too large ...
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