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I found lsp-mode to be quite cool (recently reformatted my machine, and so decided to modernize). lsp-ui + company mode kills the input latency on any 4k display on Ubuntu tho. Input latency is now VS-Code/Atom level slow. Unbearable. Even with delay set to 0

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This is much, much better on Emacs 27 with native json parsing. Once the language server is fully loaded (which can take a little while sometimes), input lag becomes insignificant again. Strongly recommend upgrading.

Mine's GNU Emacs 27.0.91 (build 1).

Thinking of switching to gccemacs for the native elisp goodness. But way too much yak shaving has been done already. I just disabled lsp-ui and lsp-company and all good.

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