Best way to filter an Editable Grid

Hi All, 

What is the recommended way to display A LOT of data in an editable grid? Right now my grid shows over 900 rows of editable data with 6 columns, so it is extremely slow to load and edit. What are my options to make this better? The grid is only for Admins to manage external user data that is called for drop downs in other records. I wanted to avoid totally reworking this into it's own record where each external user in the list is it's own record that you have to click into to edit or create new ones -- this seemed like a more complicated process to me. 

It seems like there is no reasonable way to filter an editable grid like you can with a read-only grid, or even apply paging. Please help! 

Thank you

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