diff --git a/slides.tex b/slides.tex
index f5a1556..2b9cedf 100644
--- a/slides.tex
+++ b/slides.tex
@@ -617,14 +617,10 @@ Segmentation fault.
 \begin{frame}{Performances}
     \begin{center}
         \Large\bf Unwinding speedup vs.\ libunwind:
-        \begin{columns}
-            \begin{column}{0.5\textwidth}
-                \alert{x15} on gzip
-            \end{column}
-            \begin{column}{0.5\textwidth}
-                \alert{x25} on hackbench
-            \end{column}
-        \end{columns}
+        \begin{tabular}{rl}
+            \alert{x15} &on \prog{\tt{}perf gzip}\\
+            \alert{x25} &on \prog{\tt{}perf hackbench}\\
+        \end{tabular}
     \end{center}
 
     \vfill