Submissions: searching past is too slow

when i try to scroll back through submissions from amonth ago the site times out. i can only search back through 30 or so forms. i need to see one in november. is there a way to search by contents of the form. is there a way to delete submissions that i don't need any more?

1. You can use the submissions filter to show submissions based on a time frame

2. You can also search your submissions

3. You can delete any submissions you like

How-to-Delete-Form-Submission-Data