LiveView Sigils surrounded with `~L"""` slows load time

[bendyorke]

When opening any elixir or eelixir files with this package, I incur a 4-10 second load time for each file. After some profiling, I've narrowed it down the the elixir syntax package, specifically these lines (currently starting at syntax/elixir.vim:109):

" LiveView Sigils surrounded with ~L"""
syntax include @HTML syntax/html.vim
unlet b:current_syntax
syntax region elixirLiveViewSigil matchgroup=elixirSigilDelimiter keepend start=+\~L\z("""\)+ end=+^\s*\z1+ skip=+\\"+ contains=@HTML fold

Commenting these lines drops the load time to about half a second.

Versions

Computer:

MacBook Air (Retina, 13-inch, 2019)
macOS Mojave Version 10.14.6

NeoVim

NVIM v0.4.3
Build type: Release
LuaJIT 2.0.5
Compilation: /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNDEBUG -DMIN_LOG_LEVEL=3 -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -I/tmp/neovim-20191107-13403-1or2rj3/neovim-0.4.3/build/config -I/tmp/neovim-20191107-13403-1or2rj3/neovim-0.4.3/src -I/usr/local/include -I/tmp/neovim-20191107-13403-1or2rj3/neovim-0.4.3/deps-build/include -I/usr/local/opt/gettext/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/usr/include -I/tmp/neovim-20191107-13403-1or2rj3/neovim-0.4.3/build/src/nvim/auto -I/tmp/neovim-20191107-13403-1or2rj3/neovim-0.4.3/build/include
Compiled by brew@Mojave.local

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/local/Cellar/neovim/0.4.3/share/nvim"

Run :checkhealth for more info

Terminal

iterm2: 3.3.6 (auto_updates)
https://www.iterm2.com/
/usr/local/Caskroom/iterm2/3.3.2 (64B)
From: https://github.com/Homebrew/homebrew-cask/blob/master/Casks/iterm2.rb

Elixir

Erlang/OTP 22 [erts-10.5.1] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe] [dtrace]

Elixir 1.9.1 (compiled with Erlang/OTP 22)

[jbodah]

Thanks for the detailed report. Would you happen to have a sample file you can share that we can repro with?

[bendyorke]

@jbodah it effects every .ex. and .eex file I open