spacemacs is very slow when open a large project

[yejunsun]

Description

Press [SPC p p] to find a project, then open it. It takes about 15s to open it.
There are 875 files, include files in subdirectory , in the project.
It's a maven project.

Reproduction guide

• Start Emacs
• Press [SPC p p] to find a project, open a large project.

Observed behaviour:
It took too long time to open a large project.

Expected behaviour:
Open a large project fast.

System Info

System Info 💻

• OS: darwin
• Emacs: 25.1.1
• Spacemacs: 0.200.9
• Spacemacs branch: master (rev. 8e1af14)
• Graphic display: t
• Distribution: spacemacs
• Editing style: hybrid
• Completion: helm
• Layers:

(javascript helm auto-completion better-defaults emacs-lisp git markdown org
            (shell :variables shell-default-term-shell "/bin/zsh" shell-default-position 'bottom shell-default-height 30)
            spell-checking syntax-checking version-control)

• System configuration features: JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

[CeleritasCelery]

You should enable caching so that it is only slow the first time (setq projectile-enable-caching t). All subsequent calls will be much quicker.

[github-actions]

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