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When you click to install a game in GOG Galaxy, it opens a modal dialog box, which spins and is often painfully slow to resolve, especially if another game is already downloading. Because they are modal, they block all other application activity.

In Steam, these dialog boxes are non-modal, so you can end up with several of them behind the main window, but you can keep going and browse / initiate the dialogs for multiple games. The steam dialogs can also chug, but the ones in GOG take even longer, under less load.

I like to browse and install several games at a time, so they will be ready when I come back. Often I will give up waiting for a game dialog to resolve in GOG, because it will take upwards of a minute. I have had them get stuck and not be resolved when I return to the room.

It's a real buzzkill. Please fix.
Disable IPv6 and restart your system. If that doesn't help, open a support ticket.