This book might interest You…

As @victorbjorklund says, it depends on what you are after. Elixir performance characteristics are pretty well documented in these forums. Examples include:

Elixir language potential evaluation (comparison with go)

Elixir is not great at heavy duty number-crunching (although, depending on what you are doing, Elixir-Nx is addressing that).

However, for things like web-apps, the templating system and process model make for very efficient, performant web-apps that stay predictably responsive under load - e.g. no “stop-the-world” garbage collection.

“Blockchain apps” is a very broad set of possible applications with wildly different performance requirements so I don’t think you’re going to get a better answer without being more specific.

Probably helps if you expand a bit what the blockchain app is (which helps understand where bottlenecks are). Its a very broad category from exchanges (where every ms matters) to web3 nft apps etc.