NOTE: You MUST disable all Mega Hack addons before doing runs for the autosplitter to properly function! This includes textureldr.
It seems like almost have of the PC Geometry Dash speedrun submissions are from people who are not using the autosplitter. The autosplitter is required for your run to have a time without loads, which is the default timing method on the leaderboard. Without it, a run that should be displayed near the top of the leaderboard by default will instead be shown towards the bottom. The autosplitter is extremely easy to set up, and there is absolutely no reason why you shouldn't be using it if you are playing on Windows.
Autosplitter Guide: https://www.speedrun.com/gmd/guide/lg6k8
Banned / Allowed Mega Hack Settings: https://www.speedrun.com/gmd/guide/mxttx