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-rw-r--r--doc/mpfr.texi3
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/mpfr.texi b/doc/mpfr.texi
index 5765cc315..7ca85080b 100644
--- a/doc/mpfr.texi
+++ b/doc/mpfr.texi
@@ -1139,7 +1139,8 @@ Here are a few hints to get the best efficiency out of MPFR:
This will avoid copying the significands;
@item avoid using MPFR from C++, or make sure your C++ interface does not
- perform unnecessary allocations or copies;
+ perform unnecessary allocations or copies. Slowdowns of up to a
+ factor 15 have been observed on some applications with a C++ interface;
@item MPFR functions work in-place: to compute @code{a = a + b} you don't
need an auxiliary variable, you can directly write