I have had an annoying issue with gvim 7.4, with patches 1-307. If I open a
large file (e.g. containing 200,000 lines) and use the global command to delete
lines, the operation takes a very long time on Windows if clipboard has been
set to unnamed. I'm assuming it's the constant copying of deleted lines to the
Windows clipboard that's slowing gvim down.
I use Windows 7 64-bit. I have compiled gvim 64-bit using ming. The issue
occurs on gvim 64-bit, 32-bit and, to a lesser extent, on MacVim.
On Windows, it takes several minutes to carry out the operation. During this
time, Windows becomes unusable, which is poor but that's another issue.
On OS X, in MacVim, the same operation takes 30 seconds. With clipboard="", it
takes two seconds.
Here are the steps to reproduce the issue:
1. Open gvim with no plugins and no vimrc.
2. :set clipboard=unnamed
3. Open a text file with about 200,000 lines.
4. Enter :g/string/d The "string" should match about 150,000 lines i.e.
you want to delete lots of rows!
5. Go for a coffee break (Windows!) or wait 30 seconds (OS X)
In practice, if I issue the command on Windows, I kill the process then open
the file again, this time setting clipboard="" before I issue the command.
The workaround (:set clipboard="") is fine if you remember it! It would be nice
if gvim did this e.g. (pseudo-code):
old_clipboard = clipboard
try
clipboard = ""
execute global command
finally
clipboard = old_clipboard
end
One consideration for side effects: currently, if clipboard=unnamed, the only
text that ends up on the system clipboard is the final deleted line, not all
deleted lines. If anything, you might want all deleted text to be on the
clipboard but that is not what currently happens. I suspect neither the last
line nor all lines is generally required. I don't care (others might) what ends
up on the clipboard and would be happy if there was no speed penalty when the
command was issued!
It would be great if someone could look at this!
Thanks
Praful
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