Despite Minecraft being many versions ahead, 1.8.9 remains the industry standard for PvP because of its "block-hitting" and "spam-clicking" mechanics, which were removed in the 1.9 Combat Update. Clients like CM-Pack are essential for this ecosystem because they provide the technical stability needed for high-level techniques like , S-Tapping , and Block-Hitting to land combos effectively. CMCLIENT - The Fastest Minecraft PvP Client
The client is lightweight, with the core files for version 1.8.8 often being less than 10MB . CM-Pack Minecraft 1.8 PvP Client