WEBDAV performance - Filr 1.1

Hi, folks!

I configured Webdav-Interface of Filr 1.1 with basic access authentification. The connection is secured by TLS 1.0 (Filr Poodle patches are active).
Uploading a large amount of small files results in very low upload speed (maybe due to the larger amount of overhead?). Are there any advices to improve webdav performance?

Client Environment:
Win7 Sp1 Prof 64bit
M$-Webdav-Client included in filemanager
Proxy configuration in Internet Explorer is disabled!

Cheers, k.