CircleCI does experiment that causes damage to our builds

Circle CI rolls out an experimental DLC stuff. It causes our build to be 5 times slower which is disgraceful.
How can I turn it off?
I addition, they don’t answer my emails to get support

You may wish to add your views to the main thread

Also, the speed that support gets back to an issue will depend on what level of service contract you have. As a ‘free’ user of the service, I find that they will often take 2-3 days.

As for changes being made by CircleCi that is one of the complications with using a SaaS solution, as CircleCI only has one overall environment to enhance, update and change.