In this video, you follow steps appropriately then you will surely be able to speed up this browser and if still, you faceless speed problem then you can Contact Safari Support Australia 1-800-921-785 or you can send an email to its support team.
for more info visit at https://safarisupportaustralia.wordpress.com/2017/09/14/what-are-the-steps-to-delete-your-saved-passwords-from-safari-on-an-iphone/