Sadly, the launch is somewhat blighted by many players suffering serious performance problems.
Twarhammer 3 sees factions fighting over the remains of a dying bear god, for various reasons.
And the game’s a good’un.

Also still to come are the official modding tools.
Those are probably a way out; hopefully we see some patches soon.
However, performance problems do not seem isolated to this combination of operating system and CPU.

Numerous people with AMD CPUs are complaining about performance too.
The Known Issues post also acknowledges the commonly reported problem where alt-tabbing can crash the game.
For now, the devs suggest either running the game in windowed mode or just not alt-tabbing.

Total Warhammer 3 is out now onSteam,the Epic Games Store, and PC Game Pass.
Do be aware that the Total Warhammer series doesn’t share game and DLC access across storefronts.
Disclosure: RPS co-founder Alec Meer (RPS in peace) wrote on Twarhammer 3.