company-clang 补全特别慢

Spacemacs
1

弹出类似补全至少需要三四秒，. 或 → 后的补全又特别快。是需要设置 company-clang-arguments 什么的么？

Screen Shot 2017-05-01 at 8.13.43 PM.png2560×1600 343 KB

GNU Emacs 25.2.1 (x86_64-apple-darwin16.5.0, Carbon Version 157 AppKit 1504.82) 

(c-c++ :variables
            c-c++-default-mode-for-headers 'c++-mode
            c-c++-enable-clang-support t)

(auto-completion :variables
                      auto-completion-return-key-behavior 'complete
                      auto-completion-tab-key-behavior 'cycle
                      auto-completion-complete-with-key-sequence nil
                      auto-completion-complete-with-key-sequence-delay 0.1
                      auto-completion-private-snippets-directory nil

                      auto-completion-enable-help-tooltip t
                      auto-completion-enable-help-tooltip 'manual
                      auto-completion-enable-snippets-in-popup t
                      auto-completion-enable-sort-by-usage t)
2

设置了 company-clang-arguments 依旧 2s+，原因大概见 Completion is really slow in “.cpp” file while it’s normal in “.c” file.

只能考虑别的 backends 了，C/C++ alternative backends