Update, 04/11/19: We've now added the ability to filter your blog's Archive page by tag usage. You can also combine this new filter with the other filter options, meaning you can narrow down posts in your Archive based on post date, post type, and tag usage.
As part of our ongoing efforts to improve Tumblr, we recently made some changes to the Archive page on desktop web. You should notice that your Archive loads faster (like, way faster), and we've given the overall design of the page a bit of a facelift.
The Archive is also now much more accessible: with this update we've radically improved its screenreader compatibility.
Read more about the Archive, and other lesser-known Tumblr features, here.