Faye

Faye is mainly developed for Ruby, which can limit its accessibility to developers who prefer or work with other languages like JavaScript or Python.

The official documentation provides basic setup instructions but lacks comprehensive guides and real-world usage examples, making it difficult for new users to fully leverage Faye's capabilities.

Faye may experience performance degradation when handling a large number of concurrent connections or messages, which can be critical in production environments with high traffic.

Configuring Faye to work with advanced routing and security features requires deep knowledge of the Bayeux protocol and Ruby's ecosystem, which can be time-consuming and error-prone.