I actually find it's less sluggish with android 11 than it originally was... but then again I don't have a lot of apps on it, mainly firefox, Rethink (firewall), Voyager (lemmy frontend that uses firefox), Adaway, and a few other ones. I don't have any games or anything on it, I only game on my pc anyway.
The bloatware that it originally came with did nothing for performance, that's for sure.