Go to Settings → Ad Blocker → Installed filters and check that you don't have too many filters enabled at the same time. The more filters you have enabled, the more effect it can have on load times and performance, especially on older machines. We don't recommend using more than 10 filters simultaneously.
Disable DNS protection at Settings → DNS, or try switching to a different DNS server.
Go to Settings → Network and uncheck Use WFP network driver, then reboot your computer. This may cause ads to appear in Internet Explorer browser and in apps from Microsoft Store.
If you are using any other apps that can affect network traffic, such as antiviruses, go to Settings → General Settings → Advanced settings and tick the Use redirect driver mode checkbox. Then click the Save button.
If you see Waiting for local.adguard.com... in the bottom left corner of your browser every time you open or refresh a page, go to Settings → General Settings → Advanced settings and uncheck the Filter localhost checkbox there.