During my time with this game as a kid, I used to find a lot of cuts that can save some time. A lot of them are just minor seconds but there is also a very big one.
Northern Valley
Dusk Valley (Weekend race only!)
Moors
Highlander Road
Bamboo Forest
That is all the cuts I found out in the game, if I missed any I will do another post about them. They might save seconds but they are worth it. Especially Shipyards, which saves minutes. Try them out in a speedrun!!
Due to an issue stemming from this being a PS1 title which can run a bit unstable, the timer can desync and produces results that differ from the actual real time it has taken to complete a lap. As such, there will now be a new annotation for runs to signify if they've been manually retimed or not.
