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The current version of fzf-tab-completion has a noticeable delay of about 1 second. This delay is likely due to my Zsh setup, which includes zdharma-continuum/fast-syntax-highlighting and zsh-users/zsh-autosuggestions. I believe that's not so uncommon.
After some investigation, I discovered that the primary performance issue was caused by grep regular expression parsing.
By implementing the following changes, I was able to reduce the initial delay from approximately 1 second to an unnoticeable 0.02 seconds.