# Switching to the New Protocol ### A little history What do we mean by old and new protocol? We are refering to older and newer v2ray implementations. We started using the older VMESS on TCP protocol in 2019 after Shadowsocks was getting blocked quite effectively by the GFW (great firewall). At the time it wasn't easily blocked by the firewall and served us well. However, the old protocol had some shortcomings, such as a poor UDP support, additional RTTs (round-trip time), and heavier CPU usage due to multiple encryptions (often resulting in the same packet being encrypted 3 times). The new protocol was developed in late 2020 and beginning of 2021. It uses a new protocol called VLESS, which is leaner. Instead of implementing it's own encryption, VLESS uses TLS. The new protocol has faster speeds, less RTTs, good UDP support, and is extremely resistant to blocking by the GFW. TO BE CONTINUED... --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.wannaflix.net/cn/installation-guides/switching-to-the-new-protocol.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.