My experience has been that it can be relatively faster.

That is, the last time I filed online it took I think practically a year before they got to it (I think the year of the pandemic)

I figure there's so few people filing by mail these days that they're able to process them faster than the huge amount of online filing.

I'm guessing they're separate teams (online vs mail). However I have no idea.

Regardless mailing has worked better for me the last couple years.

Additionally I do not have to use the third party ID verify thing (might just be for accessing information on irs.gov) that I am just sure is going to have a breach and can not for the life of me fathom why our government (Federal) needs a private company to verify the identity of a citizen via government (State) resources.