I would suggest the shortcode be placed on the page only once. The Circled template does have a category filter which can be enabled.
I suggest using this shortcode:
[connections enable_category_select='TRUE' enable_pagination='TRUE']
If you want you could use the Enhanced Categories addon instead of using the builtin category filter. But I definitely recommend enabled pagination and using the shortcode on the page only once when displaying so many entries. That will keep page load times more reasonable.
Hope this helps, let me know.