Ive got a few funtoo images in gentoo, built from the recovery CD of course. I can offer a few pointers certainly :)
dont disable ipv6 unless there is an explicit (and good) reason. EG you're running HPC in an infiniband cluster or something, or RDMA over converged ethernet.
enable VMXNET3 ethernet driver in the kernel. this is a faster driver not because Linux is better at using it, but because the VMWare hypervisor doesnt have to work to virtualize an ethernet driver.
ensure the video card in the vsphere console is set to intel, or some manageable low-overhead card, and X should just work with stock drivers. Granted, you can use VESA and such but 2d accelleration wont be available using GL.
dont run vmware tools. its a crutch for people who dont have a monitoring solution. it poisons the kernel to snoop processes for io stats in order to manage backend storage allocations, which can actually degrade performance in large VMWare environments with MCLOCK set to 0. VMXNET3 has already been included in the kernel for ages now, so again, avoid this "toolset"