SSH into the VCSA and run vimtop see if you have any performance issues.
The speed is definitely not comparable to the C# client.
Anyway, which deployment size did you select in the wizard? IMO one should at least select "small" rather than "tiny" even for a very small environment, so that the appliance has sufficient memory.
I can attest to this. I have seen a few instances where someone sets the installation to tiny and then a few months later we had to replace the appliance due to poor performance or corruption.