Speedrunning puzzle mode in this game is a little bit glitchy. For some reason, campaign completion fake messages with bronze, silver and gold medals will appear after driving any map, or even after creating a new profile, only if you've beaten any level before. This is a problem, because the main timing method for puzzles is RTA, and skipping useless messages will cost you a little bit of your time. Here's the example of the message:

In order to avoid these, you'd have to delete the scores file of your profile, which is stored in AppData/Local/VirtualStore/<game location>/TrackMania/GameData/Scores/, everytime you start up the game. It is recommended to run the game with the last loaded profile that you use for speedrunning.