RouterOS - SFP+ very low speed (crs328-24p-4s+rm)

RouterOS Beginner Basics
1

Hi all,

I have a speed issue with my CRS328-24p-4s+rm, when connected via SFP+ ports.
I have a server connected via SFP+ Fiber cable (10Gbps) to the crs328-24p-4s+rm and a direct copper link to the ISP Router (1Gbps).
I realized some internal speed problems and if I do a basic Internet speed test, the Download speed is between 3-6 Mbps when executed from the Server (or any other device connected via SFP+)? If i connect the server via normal Copper RJ45 cable, the Internet Speed is maxed out.
Just for further testing, i switched the OS to SWOS, and there I have no issues with the Fiber SFP+ ports.
Is there any setting in RouterOS, which need to be de/activated?

crs328-24p-4s+rm
RouterOS: 6.45.2
I reset the configuration, so no additional settings are active…

Thanks in advance for your help.

2

Try downgrading to 6.44.5 long term version, suggest using netinstall to do downgrade

3

Thanks for the suggestion CZFan, I downgraded and 6.44.5 is running now - unfortunately still the same performance.
The weird part is that the download (~0.36 Mbps) is way slower than the Upload (93 Mbps) - for me the Upload is performing as it should - just the download has speed problems :confused:

Any other suggestion?