Plee's questions

I have a server setup with 8 cores and 32gb of RAM. I am using it to launch as many java applications as I can and hope to make the most efficient use of my resources. Upon launching I notice the server begins lagging fairly badly and Xtightvnc is using up 100% of my cpu. Only 1 core is being utilized while the other 7 are sitting comfortably. Is there any way to allow tightvnc to utilize the rest of the cores or is tightvnc only optimized to use a single core? If not are there any alternatives for me to access my server remotely while being able to run as many applications as possible? Thank you in advance.

I'm trying to create a VM using KVM and virt-installer. When i use virt-install I get the following error:

Starting install...
Retrieving file .treeinfo... | 0 B 00:00:00
Retrieving file content... | 0 B 00:00:00
Retrieving file info... | 63 B 00:00:00
ERROR Couldn't find hvm kernel for Ubuntu tree. Domain installation does not appear to have been successful. If it was, you can restart your domain by running: virsh --connect qemu:///system start test otherwise, please restart your installation.

This is my virt-install command:

virt-install \
--name test \
--ram 16384 \
--location="./images/ubuntu-18.04.4-desktop-amd64.iso" \
--disk path=/var/lib/libvirt/images/kaleb.qcow2,bus=virtio,size=100 \
--vcpus 4 \
--graphics none \
--os-variant=ubuntu18.04 \
--network bridge=test \
-x "console=ttyS0"

I saw in here https://askubuntu.com/questions/1116383/couldnt-find-hvm-kernel-for-ubuntu-tree to switch from location arg to cdrom, but I need the extra-args to forward the console to tty. Any help please?