I’ll try to explain it in the way I understand it:
I think after COVID, Texas and Florida saw mass immigration from states like California and New York that had similar viewpoints. I had two students leave KY for Florida and the mama put on Facebook that the decision in part was because of Beshear.
Immigrants are also voting more conservatively. It makes sense because of religion, but for decades, they voted solidly blue. You’re seeing Cubans and Venezuelans do this in Florida.
Many states choose not to count mail-in ballots until after the election polls have closed. This will naturally cause a delay in some votes and more dems vote this way.
I think that blinders cause the last point, I think states that do ranked choice like Alaska also take some time, but I agree, it does take way too long to count.