Comment by Pannoniae

Definitely, TW can "cheat" a lot with using sprites/very low LOD at distance, only streaming the corresponding units on battle load, and it's turn-based so performance isn't critical. Although obviously you won't be doing those 50000 unit battles on the web.

Off-topic sidenote: what's with all these new projects targeting WASM instead of native, even if packaged for desktop anyway?