> Not only with autocompletion delay to 0.0, but also setting the

> minimum prefix to 1, so that it activates on every keystroke;

> the default is 3.

There, from my config:

  (use-package company
    :after lsp-mode
    :hook (lsp-mode . company-mode)
    :bind
    (:map company-active-map
          ("<tab>" . company-complete-selection))
    (:map lsp-mode-map
          ("<tab>" . company-indent-or-complete-common))
    :custom
    (company-minimum-prefix-length 1)
    (company-idle-delay 0.0))

I had no performance issues whatsoever with it. The suggestions tend to be better in quality when coding in Typescript due to the type hints compared to, say, Perl being designed around dynamic typing. But that's a limitation of the language.