Blade8895

Hi, i hope you guys out there with far more network experience then me can help me a bit here... i got a problem with my Upload on my Office. My Office has 2 Servers and some Computers. I get from my ISP 200Mbit Down and 100Mbit upload. It is an FTTH Connection (OpticalFiber) i think it is capped around 300kbit per Upload connection? And i dont think it is a missconfiguration of a Server because all 2 Servs and local laptops have the same problem. I already checked: - The Router (Fritz!Box 7590) <- But can be broken anyways ?? - The Switch (it was an older Managed switch that i changed for testing purposes to an new unmanged switch) - All Cables (Cat7) Internal Data transfers are great so i dont think it is the infrastructure itself. i had iperf connection tests from my 2 servers. and upload tests from my own laptop. LAN WIFI what it can be? is it my fault at this point ? or did the ISP messed things up? (ticket is already open... but yeah they have the same infos and images... and dont really respond and jsut send me generic emails) I would take any advices to check things! MfG Blade8895