Yes, Mavericks started using SMB2 which has many reported performance issues [0]. Most people experiencing it can work around this by using cifs:// instead of smb:// or disabling SMB2 and reverting to using SMB1 [1].

[0] https://discussions.apple.com/thread/5470025?start=0&tstart=... [1] http://cammodude.blogspot.com/2013/10/os-x-109-mavericks-wor...