> Secondly, a virtual machine may have more jitter in scheduling the transmission and the response. I have very recently been over exactly that with a customer

> Secondly, a virtual machine may have more jitter in scheduling the transmission and the response. I have very recently been over exactly that with a customer that had considerably increased network latency on some VMs on his VMWare cluster when the CPU was under load. From the very beginning I was pointing to the hypervisors scheduler, and ended up measuring the time when the interrupt handler for the network card was active to receive the packet (which no linux or program setting could really influence). It took some convincing and arguing, but they found the magic setting on the hypervisor that made the problem go away (aptly named Latency Sensitivity). I'm sure both AWS and GCP teams have that under very tight control, but especially the cheapest instances with the smallest and burstable CPU budgets that you would run for such a project are probably running with the noisiest neighbors on the most oversubscribed hardware.