Bug 64097 Loading icons always lookup the bundle
When UI and IDE are loading the icons, they are looking up the bundle for every icon they are trying to load. Looking up a bundle is not specially slow but is not the fastest operation either, therefore it could be great if you could lookup the bundle once and use it to load all the icons. Doing that will probably slightly improve the startup time.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchAdvisor.java
}
	}
	
	/**
	 * Returns the set of versioned feature ids of all installed features.
	 * The format of the ids are featureId + ":" + versionId.
	 * The feature set excludes features that do not have their own
	 * feature plug-in.
	 * 
	 * @return set of versioned feature ids (element type: <code>String</code>)
	 * @since 3.0
	 */
	private Set computeFeatureSet() {
	    Set ids = new HashSet();
	    IBundleGroupProvider[] providers = Platform.getBundleGroupProviders();
	    for (int i = 0; i < providers.length; ++i) {
	        IBundleGroup[] groups = providers[i].getBundleGroups();
	        for (int j = 0; j < groups.length; ++j) {
	            IBundleGroup group = groups[j];
				String version = group.getVersion();
				String normalizedVersion = version == null ? "0.0.0" 
                        : new PluginVersionIdentifier(version).toString();
				ids.add(group.getIdentifier() + ":" + normalizedVersion); 
	        }
	    }
	    return ids;
	}
	
	/**
	 * Returns the ordered set of versioned feature ids new for this session.