Network Switch Limiting Upload Speed?

[zokiy]

Hi,I bought recently a managed network switch (tp-link) to use on my LAN everything is default, nothing changed plug and play. My problem here is, that my switch actually causes my upload speed to drop from 300 to 240-ish. Download speed is not changed, direct connection from the router gives me a symmetric 300/300. I have faith in my setup I even used SFTP cabled across my home. 

Plenty speed tests confirm the lower upload speed. I tested using every method available even p2p and still my upload never reached above 232

Any ideas ?

 

[Alex Atkin UK]

Have you checked if Green ethernet is turned on or off?  QoS?  Are you able to test LAN to LAN speeds?

 

Its very odd for a Switch to reduce speeds like that as by default it should be more-or-less passive, just dumping the packets out the correct port for the destination MAC address.