Add CPU profiling page

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diff --git a/docs/dev/README.txt b/docs/dev/README.txt
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+Glances profiling
+=================
+
+First install Sphinx and the RTD theme:
+
+    apt install graphviz
+    pip install gprof2dot
+
+Then generate the profiling diagram:
+
+    cd <Glances source>
+    python -m cProfile -o /tmp/glances.pstats ./glances/__main__.py
+    gprof2dot -f pstats /tmp/glances.pstats | dot -Tpng -o /tmp/glances-cprofile.png
+
+Example:
+
+.. image:: https://raw.githubusercontent.com/nicolargo/glances/develop/docs/dev/glances-cprofile.png
diff --git a/docs/dev/glances-cprofile.png b/docs/dev/glances-cprofile.png
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index 00000000..866cbf4b
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+++ b/docs/dev/glances-cprofile.png