vim lsp causing huge slow down on large C++ file

[spartan-117]

I've several source file above 2k lines of C++ file and in each of them the vim-lsp plugins bring a important slow down when you change mode N -> I or I -> N

It seems that the biggest bottleneck comes from this function :
75_handle_semantic_tokens_delta_response defined in start/vim-lsp/autoload/lsp/internal/semantic.vim

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