A Denial of Service attack (flood the server with requests) might look like that. What I would do instead though, is have the form pre-filled and scripted to su

A Denial of Service attack (flood the server with requests) might look like that. What I would do instead though, is have the form pre-filled and scripted to submit the moment it’s live. That might be done with curl/Python/etc to skip the browser render too. If so, it might also inadvertently look like DOS if they forgot to put a delay between attempts.