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Get the latest version of iTerm and zsh: Make sure you're running the latest version of iTerm and zsh. These updates can help to improve performance and fix any bugs that may be causing issues.

Disable unnecessary plugins: Plugins for iTerm and zsh are great, but too many of them can slow down your system. Disable any plugins that you don't use regularly.

Use a lightweight shell theme: A heavy shell theme with lots of customization can also slow down iTerm. Use a lightweight shell theme to improve performance.

Adjust the size of iTerm's buffer: The larger the buffer size, the slower iTerm will run. Adjust the buffer size to a value that works best for you.

Use a faster font: Some fonts render slower than others. Use a faster font like Fira Code or Monaco to improve iTerm's performance.

Disable Transparency: Transparent windows and backgrounds are beautiful, but they have a performance cost. If you want improved performance, disable transparency.

Use zsh's built-in tab completion: iTerm's tab completion can be slow at times. Use zsh's built-in tab completion instead to improve performance.

Reduce the number of shell aliases: Aliases can make work easier, but too many of them can slow down your shell. Limit the number of shell aliases.

Switch to a different shell: If all else fails, switch to a different shell. Fish and Dash are two great alternatives to zsh.