The new firmware comes with version number T72XXXU2DUD1 and the usual Android 11 and One UI 3.1 goodies. It doesn't include the latest April 2021 Android security patch, but Samsung should release it soon.
The Android 11 update is seeding in Russia and the UK at the time of writing this, and it shouldn't be too long before the rollout in other countries begins.
If you live in the UK and Russia and haven't received the OTA yet, you can try checking the update manually by navigating to the Settings > Software update menu on your Galaxy Tab S5e.
Yes experiencing the same here. Wish i check on feedbacks before updating. It's kinda useless now using the browser on Dex. It always prompts that it's overheating
Same problems, after the last update, heating warnings and slow performance. This is a serious issue.
Do a factory Reset