I'm not sure it's fair to say that the industry has added overhead versus the 90s. Unless you're talking about gamedev, which I can't comment about. But it's hard to say that tech in general is slower moving as an industry than thirty years ago; I think there's more nuance to it than that. What exactly that nuance is I'm not completely sure, but here are some counterexamples:

Intel shifted the entire direction of its company away from memory and into microprocessors as early as the 1980s, in response to smaller, allegedly faster moving Japanese competitors.

IBM has been a slow-moving behemoth for decades; the story of how DOS began is an idiomatic David vs Goliath tale of the industry.

Apple debatably rose to prominence on the back of tech lifted from Xerox, which for one reason or another (maybe they were too confident in their fax machines) didn't ship their own tech.

Google was at one point a fast-moving startup, up against slow-moving competitors like AltaVista, arguably Yahoo, MSN.

Amazon's original web stack was written in C, iirc. I personally would have a hard time arguing that things done today in web development could be done faster in C.