1. Improving Performance
Close unused projects in the workspace
Eclipse caches files for all open projects in the workspace.
Disable Eclipse features which slow things down
C/C++ Indexer
Description: The indexer uses the parser to create a database of your source and header files that provides the basis for C/C++ search, navigation features and parts of content assist.
The indexer runs on a background thread and reacts to resource change events such as:
C/C++ project creation/deletion
Source files creation/deletion
File imports
Source file content changes
To disable
Click menu ‘Windows’ -> ‘Preference’
Expand ‘C/C++’ -> ‘Indexer’
Select ‘No Indexer’ in drop-down menu

2. Improving Performance
Disable Eclipse features which slow things down (con’t)
Scalability
Description: Scalability options configure how eclipse deals with large source files.
Scalability options
Editor live parsing – impacts parsing while typing, Outline view, semantic highlighting, folding, etc.
Semantic highlighting – C/C++ identifiers are colored
Syntax coloring – coloring of keywords, comments and literals
Parsing-based content assist proposals – content assist proposals which require parsing the file
Content assist auto activation – content assist activated automatically on trigger sequences, like '.', '::' or '->'.
To disable:
Click menu ‘Windows’ -> ‘Preference’
Expand ‘C/C++’ -> ‘Editor’ -> ‘Scalability’
Uncheck ‘enable scalability options’

3. Improving Performance
Disable Eclipse features which slow things down (con’t)
Content Assist Auto Activation
Description: Content Assist is a set of tools built into CDT that can reduce the number of keystrokes a developer must type to create code. The Content Assist plug-in consists of several components that forecast what a developer will type, based on the current context, scope, and prefix.
To disable
Click menu ‘Windows’ -> ‘Preference’
Expand ‘C/C++’ -> ‘Editor’ -> ‘Content Assist’
Uncheck all the options for ‘Auto Activation’