Hi Jeremy
Point one seems to refer to a past problem. I believe that we have addressed this. There is a stable tag, which is current and there are CI vagrant images that are stable. I cannot change the past. The clear way for getting issues fixed is and always has been to raise a support request in Jira Are you having stability issues currently?
The slowness issue is vague. Our team use vagrant daily. It *is* slower than a native linux install, but that is the nature of VM's; they run more slowly than they would native. We have made changes to the default configuration based on a recommended machine specification of 8GB ram on a recent spec machine. If developers' machines have less ram, they can reduce the ram allocated to the VM which will mean more ram for host, which could improve performance. The recommended minimum ram is just that. We recommend that you have 8GB ram. The CI job that builds vagrant images, runs, builds a drupal site and checks that the site can serve requests. If you need time outs changed because your tests are taking a long time to run, we can make that change. Raise a ticket.