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profiles/desktop/.emacs.d/early-init.el

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+;; set native compilation cache directory
+(startup-redirect-eln-cache
+ (convert-standard-filename
+  (expand-file-name "~/.cache/emacs/eln-cache/")))
+
+;; performance tuning
+;; set as recommended at https://emacs-lsp.github.io/lsp-mode/page/performance/
+(setq gc-cons-threshold 100000000)
+(setq read-process-output-max (* 1024 1024)) ;; 1mb
+(setenv "LSP_USE_PLISTS" "true")
+(setq lsp-idle-delay 0.500)
+(setq lsp-log-io nil) ; if set to true can cause a performance hit