I noticed that overtime when speedrunning the game (whether it's based on time spent, or on the number of times you start, quit and continue the game, I don't know), The load times are getting slower and slower gradually.

By load times I mean the time you wait for the game to load, after starting a new game, after continuing an existing game, or the delay you experience when touching a checkpoint. Those load times affect only RTA timing, IGT is unaffected.

Since the fast routes for the game require you to quit and continue often, even a slight delay in load times is carried over to a noticable final amount during the run.

So, I recommend to reset the browser every 5-10 attempts to reset this delay.