VMware vSphere ESXi
VMware vCenter Server
There are many ESXi/ESX host components that can contribute to network performance.
Validate that each troubleshooting step below is true for your environment. The steps provide instructions or a link to a document, for validating the step and taking corrective action as necessary. The steps are ordered in the most appropriate sequence to isolate the issue and identify the proper resolution. Please do not skip a step.
If your problem still exists after trying the steps in this article:
For related information, see:
Choosing a network adapter for your virtual machine
Verifying the integrity of the physical network adapter on an ESX/ESXi host