Added overloaded methods with "Deep" parameter that allows you to search for all descendants of a specified element/document (not only immediate child).
Improved methods to move a node from its current position to a new position if the node was appended before (under the same document). Previous behavior: if the node had a parent node then an exception was thrown.
FTP
Introduced FTPTextBufferSize, FTPWriteBufferSize, CtlPollInterval for better control over data channel throughput.
Transmission parameters tuned up to provide for better transfer speeds in default configuration (client and server).
Improved transfer resumes interoperability with some third-party servers.
Improvements in LIST command processing ('LIST -l' command is now handled gracefully).
HTTP
Added support for path-only (not full URL) redirection requests in OAuth2.
SFTP
Added EarlyIDString property for better compatibility with AWS SFTP servers.
SSH
Some internal changes made to PKCS#11 SSH key storage to make it better support some HSMs.
PKI
Increased speed for most of supported symmetric algorithms by optimizing internal performance.