50 FPS is the norm for any racing MTA server. You won't fix the maps but you could make the gameplay more fair by removing the user FPS limit and forcing it to 50 as it should be. It's no secret that boats get bugged above 50 FPS. Not to mention that players who have set their game to 100 FPS have a huge head start versus players on the normal 50 (most actually can't get higher than 50, even though they may want to so it's simply not fair as @Gonzalezo mentioned). Also on a straight road the 100 FPS guy always becomes first. It's just seen how the 50 FPS player lags a lot compared to the 100 one. Not to mention that the vehicles' handlings become practically complete different than what every single player is used to from other servers. The Elegy and SuperGT do not drift at all compared to how they are on 50 FPS.
Another thing to consider is adding this script in the server: http://www.mediafire.com/file/k20cr9ux2skp8r4/removerandomobjects.zip It removes all randomly spawned little trees and rocks that every time spawn in a different location in the forests or near the roads and ruin a player's run no matter how good they may know the map itself.
These are just solutions to two of the three problems MrGreen has - the third being the map quality (which will never be fixed so whatever). I'm just saying how 90% of MTA race players like to play. Not trying to bash the server for how bad it is as if these things are done it'll get a bit better, no doubt. The toptimes update was great some years ago, the best toptimes system to date on any server. The available scripts are perfect and useful as well. @Ywa you said it yourself - the game was not designed to handle even 40 FPS, let alone 100 (there's a reason that the map editor's default FPS limit is always set to 36 after we freshly install MTA). But it's been proven over the years that the sweet spot is 50 FPS. The game feels much smoother than on 35, but also feels the same in terms of vehicle handling and overall gameplay.
As always this is said about the Race server, not Mix. If Mix wants it, sure, if not, don't comment as it's not about you. MrGreen can be a great server if you only start looking a bit at other racing servers for a moment. There's nothing wrong to be the same as them if it means being better than you currently are.
Obviously certain admins will reply instantly saying that what I wrote is not true but then again they don't get out of MrGreen to see that some stuff are better elsewhere. I'm simply suggesting for the better stuff to make their way to here as well just like I suggested your toptimes system to be incorporated into FFS.