Honestly, pair with your iPhone and name your Watch. After that don't really expect anything for a couple days. Don't really even do any requests. Let the watch "warm up" for those two days.
By the 2nd or 3rd day, that thing will do most things without flaw. Siri will work good, txt to speech will be lightning etc.
There's a thing about freshly installed OSes on the Watch, they take a few days heck even sometimes a week before things are ALL active.
Also these things are not even close to the 1st Gen Watches, by the time my friend comes around to getting say an Apple Watch Series 8, he's gonna be like "this is SO fast", like these are they are insanely fast...