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diff --git a/Development/Documentation/GlamorPerformance.mdwn b/Development/Documentation/GlamorPerformance.mdwn
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@@ -69,3 +69,9 @@ Might be nice to add support for more formats? Should inspect the source to vari
Switching among shader programs isn't free. Would be worth investigating whether a single shader performs as well as the current design.
+## Flush reduction
+Currently we flush in BlockHandler, which is quite often. Strictly speaking we only need to do this when we're trying to synchronize between the X and GL command streams (or, arguably, when sending damage events), and can otherwise let the implicit flush in SwapBuffers do the job for us.
+The GL sync extensions should be able to help us out with this, though on at least i965 they're equivalent to a flush so they're not _that_ much help.