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Source: http://www.vogella.com/tutorials/EclipsePerformance/article.html#tracing

1. Create the .options file under eclipse folder with the content as follows:
# turn on debugging for the org.eclipse.core plugin.
org.eclipse.osgi/debug=true

# turn on loading time for the plug-ins
org.eclipse.osgi/debug/bundleTime=true

2. Run Eclipse in debug mode:
# start Eclipse with the test workspace
# piping the output into a file
./eclipse -debug -data > trace.txt

3. Extract lauching time info from the trace:
# extract the lines starting with "End starting"
grep "End starting" trace.txt > trace2.txt

4. Sort plugins by launching time using Excel