I'm new to speedrunning the game on PC and a few runs I've seen that are posted to the leaderboards have splits and I'm wondering if it's required for all categories?

And if we do need splits, what sections do you recommend to make a split for?

Required for PC since we use LRT autosplitter to time the runs, not needed for consoles because they use IGT.

Console is not required to have splits or a timer on screen (but it's always nice to see). On PC, you have to at least have the timer with the Load Remover displayed, whether you choose to have splits is up to you.

I know you didn't ask this, but since it's a common rejection point for runs, make sure you have the loading icon (top left corner) and ammo count (lower right corner) unobstructed, and on PC, your FPS also needs to be displayed (can enable this though Steam).