AdGuard slows down network connection

There may be a conflict with other apps — for example, antivirus software such as Kaspersky.

A good approach is to reset settings (make sure to do a backup beforehand) to ensure that nothing has been changed unintentionally.

Another way to address this issue is to go through the app’s modules, like DNS protection or Tracking protection — disable them all and then re-enable them one by one. This will show which of the modules is interfering with the connection and eventually solve the issue.