Why does Claude Code get slower and dumber the longer you use it? The Speedify developers explain how the Claude Code plugin in Visual Studio Code actually reads all your open tabs and sends them with every prompt, which means the Claude AI slows down, takes in extra input, AND uses more tokens with each prompt.
We compared Claude Code vs Cursor vs Codex, and we've also found Claude also gets dumber the longer your session goes, because it replaces your conversation history with AI summaries to save memory. The longer your Claude conversation, the more your session data gets replaced with AI slop. So, if you're using Claude Code, make sure you close those extra VSCode tabs.
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