Slow transfer big files with CIFS. NFS works fine

I have a RAID 5 with LVM. I have created 2 filesystems, ext4 and xfs and share with cifs and nfs. The transfer of big file with cifs is very slow

From another computer I transfer a file of 1Gb and 4Gb with this times:
NFS: 1Gb -> 15s
NFS: 4Gb -> 60s
CIFS: 1Gb -> 15s
CIFS: 4Gb -> 900s!!!!!!

I have put this parameters (read in another post)
max protocol = SMB2
max xmit = 65535
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_SNDBUF=65535 SO_RCVBUF=65535
read raw = yes
write raw = yes
max connections = 65535
max open files = 65535

But the same Issue