When playing cross-platform games between PC (W11 Home V. 21H2), and Nintendo Switch, we have seen severe lag on all local games, anytime the Switch user interacts with a dialog, such as typing in the chat, writing text on a sign or book, etc. We have seen this issue since at least 1.17, and maybe earlier, and it is still an issue today, in 1.19.30. This bug does not seem to affect realm gameplay.

This seems to happen regardless if the switch player is the game host, or the PC player.

We have tried deleting worlds, resource packs, reinstalling Minecraft on both the PC and Switch, reducing simulation distance, render distance, and many other things, and nothing seems to help in the least.

Searching for this issue, it appears that any similar reports were marked resolved, and were for much earlier versions of Minecraft.