This game is lagging way too much

https://youtu.be/gqxMLE7EdQk

This is what happened when I tried playing tiamat for the first time. I couldn't control where I was going. When I died I couldn't respawn. Went to the shopkeeper to buy more injury kits, but it got stuck on quantity selection. I couldn't buy or get out of it. I turned it off n thought "I ain't touching this game again"