Open buffer without loading ftplugins

Question

I have huge file and quite slow plugin (loaded by vim-plug) for corresponding filetype. I want following:

1. Plugin is loaded by default
2. Option to fast open this file without loading plugin. Something like: turn all plugins off, load buffer, turn all plugins on.

UPD. In my case I want to copy some content of buffer A, then quickly and temporary read huge file to buffer B, paste content and save buffer B to huge file, and then return to buffer A. When I read huge file to buffer B I want all plugins to be turned off so reading is fast.

P.S. I've tried :edit +cmd ++opt but it doesn't help:

:edit +filetype\ off file.org
:edit +se\ filetype=off file.org

it seems that options apply after opening the file and loading plugins.

Answer 1

Most “core” filetype features are covered by autocommands, so disabling them will have the effect that you want. But we only want to disable them when opening a particular file, so

:noautocmd edit {file}

Answer 2

1. Remove the plugin. Seriously. "Huge and slow" = "trash bin". If you're brave enough then go and re-implement all required functionality yourself.
2. Remove/rename/comment out ftdetect folder/script (or use alternate extensions, so ftdetect never matches). Whenever you need the plugin do :setf org manually.