These bugs I faced in new Unity version. I don't know if someone already reported them, but they still exists in latest update, and existed 3 versions earlier.
(The game itself runs fast and smoothly on almost any settings)
1. Bug with player movement:
When I'm playing new Unity version sometimes I see this strange bug. If you will pause the game for a while and/or alt+tab window to another one (for some time), and then return back - the player sometimes move incredibly slowly. I faced this bug in creative mode when the player is no flying, if player starts to fly - it will have normal speed, but if it will stop - the bug happens again. After certain amount of time the bug may disappear or not.
2. Bug with console:
If you start the game and type something into the console - you can easily remove letters with backspace if you have a mistake. But if you will alt+tab window and try this again you may notice that it is impossible to remove letters. You can type more letters, but you cant remove them.
3. Bug with game exit:
On game exit independently from what point it was done (from world or main menu) the game will crash after correct world saving.
My system spec:
- Windows 7 (Professional), 64 bit;
- Intel Core I7-7700;
- Nvidia GeForce GTX 980.