Global Interpreter Lock limits Ruby concurrency
7/10 HighMRI Ruby's Global Interpreter Lock (GIL) prevents true parallelism. While Fibers and async libraries provide some help, Ruby cannot match the seamless concurrency capabilities of Go's goroutines or Elixir's lightweight processes.
Sources
- Is Ruby On Rails Still Relevant In 2025? A Deep Dive
- Why we still build with Ruby in 2026 - Lago Blog
- The Future of Ruby: Is It Still Relevant in 2025 and Beyond? – The ...
- July 26, 2025 – The Rails Drop
- Deconstructing a Hype: What People Think Is Wrong With Ruby?
- Why we still build with Ruby in 2026 - DEV Community
- Why Ruby Is Not Widely Used: An In-Depth Analysis
Collection History
Query: “What are the most common pain points with Ruby on Rails for developers in 2025?”4/9/2026
While Ruby has made strides in this area, such as with the release of Ruby 3.0 (introducing Fibers and better thread support), it still trails languages like Go, which was designed with concurrency as a core feature.
Query: “What are the most common pain points with Ruby for developers in 2025?”4/8/2026
Ruby has a Global Interpreter Lock (GIL) in MRI, which limits real parallelism. While Fibers and async gems (`async`, `polyphony`, `concurrent-ruby`) help, it's not as seamless as Go's goroutines or Elixir's lightweight processes.
Created: 4/8/2026Updated: 4/9/2026