rsync 数据同步速度慢？

`-avzP`

WTF？25MB？

[root@Zabbix-4 ~]# time rsync -avzP --delete 1110/ 1111/
sending incremental file list
./
VMware-VMvisor-Installer-6.7.0.update03-15160138.x86_64-DellEMC_Customized-A04.iso
    355,411,968 100%   25.63MB/s    0:00:13 (xfr#1, to-chk=0/2)

sent 350,631,396 bytes  received 38 bytes  24,181,478.21 bytes/sec
total size is 355,411,968  speedup is 1.01

real    0m13.227s
user    0m14.024s
sys     0m0.463s

删除`-z`选项

WHAT？330MB？

[root@Zabbix-4 ~]# time rsync -avP --delete 1110/ 1111/
sending incremental file list
./
VMware-VMvisor-Installer-6.7.0.update03-15160138.x86_64-DellEMC_Customized-A04.iso
    355,411,968 100%  336.56MB/s    0:00:01 (xfr#1, to-chk=0/2)

sent 355,498,924 bytes  received 38 bytes  236,999,308.00 bytes/sec
total size is 355,411,968  speedup is 1.00

real    0m1.011s
user    0m1.472s
sys     0m0.427s