Slow upload speed (server) but fast download.

Hello all,

I'm currently having an issue with my VMware ESXi 5.1 server.

I noticed slowdowns in my virtual machine so I backtracked the problem down to the esxi server itself.

Uploading files to esxi/the vm is blazing fast, but the connection down from it is damn slow (about 400KB/s).

When I look at the 'Performance Windows' -> Network I also see the following results:

vmnic01 | Data Receive Rate | Max: 5368

vmnic01 | Data Transmit Rate | Max: 484

This basically verifies my problem - but I cannot find any cause of it.

Any ideas?