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-rw-r--r--doc/articles/speed.rst10
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/articles/speed.rst b/doc/articles/speed.rst
index f4c4808d..5b3a8fbd 100644
--- a/doc/articles/speed.rst
+++ b/doc/articles/speed.rst
@@ -127,3 +127,13 @@ you limit the resolution at the integration stage, the number of reflections to
be integrated will be much smaller, which can lead to a significant speed
improvement. However, the ``--push-res`` value that you use for merging must
be smaller than the value used for integration.
+
+
+Use a static detector geometry
+==============================
+
+CrystFEL geometry files allow some aspects of the geometry to come from the
+data files, such as the panel z-positions ("clen"/camera length) and overall
+detector shifts. If you can instead give fixed numerical values for
+everything, then some parts of CrystFEL can prepare calculations in advance.
+In some cases, this can make a significant speed improvement.