Very slow speed of SMP/AFP on wifi

Good evening Sterling, thanks for your two cents.

I made a different series of tests and I can state that the bottleneck is at the moment the file transfer protocol over wifi.

As I wrote my nas is connected to my router using an ethernet cable. connection speed between router and nas is about 110MB/s birth reading and writing.

I can achieve this transfer speed between MBPro and router (and obviously the nas) using an ethernet cable. switching to wifi connection this speed fall down to about 9 MB/s. so the problem is not the NAS but samba over wifi

To double check this I tried a file sharing between my MBPro15 and my two other MBPro 13 running Sierra and high Sierra and my workstation running Catalina. Sharing files on all this computer I got the same result: file transfer speed is always 9MB/s

Searching for solution on the net I found that a lot of people have thew same problem and exactly the same maximum speed for samba and AFP on wifi connection: max 10MB/s

I tried some suggested solution like

sudo sysctl -w net.inet.tcp.delayed_ack=0

I tried to disable samba signing

but nothing worked

thanks, Antonio

Good morning Joseph, thanks for your help.

Unfortunately the problem is not my internet connection speed but files sharing speed from My NAS using wifi connection.

I mentioned the internet download speed to give a reference parameter.

My internet connection transfer rate is about 95MB/s so near the maximum speed for a 5GHz wifi network so is not slow.

The slow side is transfer rate from my NAS using samba or AFP; in this case transfer rate fall down to 1/10th at about 9MB/s

This means that the reason why my NAS access is so slow isn't inside wifi connection that can work at higher speed rate but regard something in the file sharing area of protocols.

while connecting to the same NAS using ethernet cable the access speed is 110MB/s about and this maens that the nas output speed is not the problem (nas is connected to the router using ethernet)

thanks, Antonio