I experience an issue with the performance of the Brave Shields. More specifically, I encounter many pages that load considerably longer when using Brave Shields compared to having Brave Shields turned off or using some other kind of blocking addon.
To recreate the issue, please follow these steps:
On a default installation and configuration of Brave (current stable version) with Shields turned on and no other addons installed, visit for example this page: www.spiegel.de (a major news site from Germany).
You can notice that after the page has loaded (loading circle in tab stops spinning) there is a delay of about 3 seconds before any page content is actually shown. During these 3 seconds, you can already see that the scrollbar of the page works (I can scroll down just fine), but (again) nothing is being rendered.
To compare this, switch off Brave Shields and reload the page. You can see that the page content is displayed instantly, even while the page is being loaded. It just feels way snappier.
You can also try using a blocker like uBlock Origin (and still deactivated Shields) and the page will also render instantly.
I have tried this on both the current version on Windows 10 and MacOS with the current stable version of Brave. There are some other webpages that show this behavior but the one I mentioned shows the most render lag time.
Do you have any idea what could cause these rendering lags?