Act as a senior web developer with 10+ years of experience in optimizing web performance. Explain the key differences between HTTP/1.1 and HTTP/2 in a way that is accessible to [JUNIOR DEVELOPERS], [SYSTEM ARCHITECTS], and [TECHNICAL WRITERS]. Cover aspects like [HEAD-OF-LINE BLOCKING], [MULTIPLEXING], and [HEADER COMPRESSION], providing real-world examples of how HTTP/2 improves [PAGE LOAD TIMES] and [NETWORK EFFICIENCY]. Use analogies where helpful and include code snippets or diagrams if necessary to clarify complex concepts.