Starting becomes very slow after update

I recently updated version 1.9.80.

Now whenever I start or restart Brave, the browser opens quickly, as it always does
But all the buttons (bookmarks, search bar, settings, minimize, close, etc.) are not immediately available.Instead, I have to wait nearly 30 seconds before I can click them.

This was not an issue before the update, nor is it with other browsers.
And here’s my PC configuration: i7-7820HQ, 16 GB memory, Win 10 Pro, so it should not be a hardware performance issue.

What could be the cause of this? How can I solve it?