Some people may be unaware, but if you're surprised the IGT is very similar to RTA, that's because it is. Jaaay and I have addressed the concerns in the official discord about loads counting towards the final time when it should not. This issue does not allow fair competition and we hope the devs have seen our messages and will consider this for the week 1 patch or another patch soon, mods of that server agree that loads need to be not counted. Expect this fix to happen eventually if not soon.

I'm assuming this was patched?

They have finally listened and the final in-game time of Arcade Mode will no longer include loading times. The leaderboard will not be reset as everything will be minutes faster anyway. If there are any other significant differences in gameplay from this upcoming patch, we can apply version filters.