File switching appears to take time proportional to number of open buffers [edit]

[nyarly]

What did you do? (required. The issue will be closed when not provided.)

I switch files in my Go project (c.f. https://github.com/opentable/sous). e.g. Using <C-^>.

What did you expect to happen?

The new file to open nearly instantly.

What happened instead?

There's a noticeable delay - on the order of half a second.

It's a drag but I've been living with it.

Update: I had many dozens of files open in buffers. Closing those out (rather: restarting Vim after stripping my session) restores quick switching between buffers.

I don't think I've seen this behavior in e.g. Rails projects, which can also accumulate buffers quickly.

Configuration (MUST fill this out):

• Vim version (first two lines from :version):

NVIM v0.2.0                                                                                                                                                                      
Build type: Release

• Go version (go version):

go version go1.9.2 linux/amd64

• Go environment (go env):

GOARCH="amd64"                                                                                                                                                                  
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/judson/golang"
GORACE=""
GOROOT="/nix/store/0b91dwiap82wpar5b225bs8wig8c7xva-go-1.9.2/share/go"
GOTOOLDIR="/nix/store/0b91dwiap82wpar5b225bs8wig8c7xva-go-1.9.2/share/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build492100358=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"

• vim-go version:
  Newest? I just did a PlugUpdate

• vimrc you used to reproduce (use a minimal vimrc with other plugins disabled; do not link to a 2,000 line vimrc):

I'll run down a reduced vim in the near future. In the meantime, c.f. https://github.com/nyarly/dotfiles/tree/master/neovim/.config/nvim

[nyarly]

@fatih This is a follow-up to a tweet earlier today.

[arp242]

This seems to work fine for me.

Could you please try and reproduce this with a minimal vimrc? This sounds like an autocmd misbehaving or firing multiple times or some such, but I'm not going to go through you huge vimrc directory to find that for you.

[arp242]

I'll close this for now due to lack of feedback. Feel free to comment if you have further problems or questions and we can reopen this issue.