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Slow files: rewrite

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References #56.
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Marco Hinz 2016-01-13 11:05:46 +01:00
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@ -1405,20 +1405,23 @@ This also shows why `~` is used to denote the home directory on Unix systems.
#### Editing small files is slow
Most of the time this is caused by syntax files using complex regular
expressions. Particulay the Ruby syntax file caused people to have slowdowns in
the past. (Also see [Debugging syntax files](#debugging-syntax-files).)
There are two things which can have a huge impact on performance:
Moreover, some features tend to impact performance more than others. Check this
list to ease slowdowns:
1. Complex **regular expressions**. Particular the Ruby syntax file caused
people to have slowdowns in the past. (Also see [Debugging syntax files](#debugging-syntax-files).)
2. **Screen redraws**. Some features force all lines to redraw.
| Option | Why? |
|--------|------|
| `:set nocursorline` | This makes screen redrawing quite a bit slower. |
| `:set norelativenumber` | Constantly computing the relative numbers is expensive. |
| `:set foldmethod=marker` | If the syntax file itself is slow already, `foldmethod=syntax` makes it even worse. |
| `:set synmaxcol=200` | Due to internal representation, Vim has problems with long lines in general. Only syntax highlight till column 200. |
| `:NoMatchParen` | Uses regular expressions to find the accompanying parenthesis. |
| Typical culprit | Why? | Solution? |
|-----------------|------|-----------|
| `:set cursorline` | Causes all lines to redraw. | `:set nocursorline` |
| `:set cursorcolumn` | Causes all lines to redraw. | `:set nocursorcolumn` |
| `:set relativenumber` | Causes all lines to redraw. | `:set norelativenumber` |
| `:set foldmethod=syntax` | If the syntax file is slow already, this makes it even worse. | `:set foldmethod=manual`, `:set foldmethod=marker` or [FastFold](https://github.com/Konfekt/FastFold) |
| `:set synmaxcol=3000` | Due to internal representation, Vim has problems with long lines in general. Highlights columns till column 3000. | `:set synmaxcol=200` |
| matchparen.vim | Loaded by default. Uses regular expressions to find the accompanying parenthesis. | Disable plugin: `:h matchparen` |
**NOTE**: You only need to do this if you experience actual performance
drawbacks. In most cases using the things mentioned above is absolutely fine.
#### Editing huge files is slow