An awesome asynchronous event-driven reactor for Ruby. (by socketry)
The Async gem is the natural successor, It's actively maintained, and allows you write synchronous code is if it wasn't non-blocking, and most libraries don't need any special support for Async (exceptions are gems with C extensions that do I/O and DB libraries with connection pooling that would otherwise be thread-based).
Sampling CPU profiler for Ruby
You could use rbspy to profile the EventMachine process as it's doing the workload, and try to see there where most of the time is being spent.
Collect and Analyze Billions of Data Points in Real Time. Manage all types of time series data in a single, purpose-built database. Run at any scale in any environment in the cloud, on-premises, or at the edge.
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