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Consider replacing the httpd with dufs , it offers a nice WebUI file manager with authentication, and complete WebDAV support. I was able to pull gigabit on both httpd and dufs, 300Mbit with Samba3. ksmbd for SMBv3 may perform better in kernel.
Around the same in memory usage.
Prebuilt executable work as is (armhf-static): GitHub - sigoden/dufs: A file server that supports static serving, uploading, searching, accessing control, webdav...