Sluggish performance when searching tags in large project

[BooAA]

Hi all, I found helm-gtags has very sluggish user experience when working on large project. Every since the user typing a word, it takes about 5~10s to get the result updated on the screen. Here is my experiment:

1. clone linux kernel: git clone --deptch https://github.com/torvalds/linux.git
2. cd into the project, and index everything using find -type f -name '*.[ch]' | gtags -f -
3. Open Emacs, M-x helm-gtags-find-tag and start searching:

I have recorded the whole process:

zpd0c-6nc8l.mp4