There are still much faster options out there but it's nowhere near the beast that it used to be.
I just get tired of hearing the "but Ruby is slow" drum beats when it's so consistently successful. Scaling web servers is easy. Scaling the database is hard.
It being successful doesn't excuse its slowness, in my opinion. There are lots of bad products out there that are successful by many metrics. Speed is an important part of making something good, and RoR added significant hurdles to making very fast sites. There are other stacks that don't have that issue that are also successful, but have other downsides.
Anyway, not worth rehashing these old arguments, I just wanted to know if it had improved. Sounds like it has.
All mature technology will come with a known set of tools and processes to tackle almost any problem very quickly, as long as you're familiar enough with the stack.
One thing that's especially productive about it that helped to grow the 3rd party ecosystem is that the options you have for dependency injection in Ruby due to monkey patching give you an experience much closer to Aspect Oriented Programming.
It also makes it easier when you need to add functionality somewhere high up the inheritance chain without having to rebuild the entire chain around your new object base, or fork the library, use your fork as the dependency and make the change directly.
In the world of object oriented web development, Ruby was close to a miracle in time-reduction in WORKING with an ecosystem.
Outside of that...it's all about the business. That's why so many successful businesses are built with Ruby and not "benchmark winner of the week" because Ruby tends to deliver on almost all of the business cases around solving problems and growth.
If you're a larger business and planning to deploy at scale to an existing customer base, the business problems tend to change more towards performance and Right Tool for the Job.