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A common and easy-to-fix cause of performance problems in Eglot
(especially in older versions) is its events buffer, since it represents
additional work that Eglot must do (see eglot-events-buffer). If you find Eglot is operating correctly but
slowly, try to customize the variable eglot-events-buffer-config
(see Customization Variables) and set its :size property to
0. This will disable recording any events and may speed things up.
In other situations, the cause of poor performance lies in the language server itself. Some servers use aggressive caching and other techniques to improve their performance. Often, this can be tweaked by changing the server configuration (see Advanced server configuration).
Another aspect that may cause performance degradation is the amount of JSONRPC information exchanged with Emacs. Using an LSP program like Rassumfrassum may alleviate such problems.