We don't know enough about warhammer 3 to talk about performance but i'd expect wh3 in battle to run better than wh2. I however think that campaignwise wh3 will probably not run very well due to its sheer size.Total war Warhammer 2, I'm planning to dock and play in my basement... Can I expect decent performance? What about potentially AOE4 and Warhammer 3 upcoming? RTS games are more cpu dependent no? Is that not great for the steam deck
warhammer 2 (and all other total wars) are very costumizable. If you want the biggest battles possible steam deck will probably suffer; if you play on high model quantity then i think the game is very feasible for the deck to run.
Generally speaking total wars don't have generally very good performance in big battles (read that as in >6000 troops). The "small" battles (1000-2000) are usually run well.