
The Nintendo Switch has a very lackluster networking setup that could hinder your experience while playing Super Smash Bros. Ultimate online or using other Switch Online services.

Super Smash Bros. Ultimate gains version 13.0.4 update to fix Nintendo Switch issue - full patch notes are here.

With Nintendo rolling out Switch 2, the company has confirmed that Super Smash Bros. Ultimate and Nintendo Switch Sports have issues on the new console. However, plans are already in place for patches.
Game developer Hideki Kamiya talks about Bayonetta in the Smash Bros. games.
I still can’t believe Nintendo didn’t bother putting an Ethernet port on the dock so people have an option for standard improved online connectivity
This "small trick" still involves more math than I'm willing to deal with.XD
No need i had 40 match with no lag or online issues, no lag from other players either, i have a very good router tho, never get signal issues