diff --git a/doc/tint2.1 b/doc/tint2.1
index 040c2be..c985bca 100644
--- a/doc/tint2.1
+++ b/doc/tint2.1
@@ -831,10 +831,11 @@ execp_markup = 1
 .PP
 .RS
 .nf
+# "stdbuf -oL" noticed to give better performance than fflush() from awk code
 execp = new
-execp_command = free | awk '/^\-/ { printf "Mem: '$(free \-h | awk '/^Mem:/ { print $2 }')' %.0f%%\\n", 100*$3/($3+$4); fflush(stdout) }'
-execp_interval = 5
-execp_continuous = 0
+execp_command = free -b -s1 | stdbuf -oL awk '/^Mem:/ { printf "Mem: %.1fGi %.0f%%\n", $2 / (2^30), 100 * ($2 - $7) / $2 }'
+execp_interval = 1
+execp_continuous = 1
 .fi
 .RE
 .SS Network load
diff --git a/doc/tint2.html b/doc/tint2.html
index 033dc77..7266ab0 100644
--- a/doc/tint2.html
+++ b/doc/tint2.html
@@ -372,8 +372,9 @@ execp_continuous = 1
 execp_interval = 1
 execp_markup = 1
 </code></pre>
-<h5 id="memory-usage">Memory usage<a name="memory-usage" href="#memory-usage" class="md2man-permalink" title="permalink"></a></h5><pre class="highlight plaintext"><code>execp = new
-execp_command = free -s 2 | awk '/^-/ { printf "Mem: '$(free -h | awk '/^Mem:/ { print $2 }')' %.0f%\n", 100*$3/($3+$4); fflush(stdout) }'
+<h5 id="memory-usage">Memory usage<a name="memory-usage" href="#memory-usage" class="md2man-permalink" title="permalink"></a></h5><pre class="highlight plaintext"><code># "stdbuf -oL" noticed to give better performance than fflush() from awk code
+execp = new
+execp_command = free -b -s1 | stdbuf -oL awk '/^Mem:/ { printf "Mem: %.1fGi %.0f%%\n", $2 / (2^30), 100 * ($2 - $7) / $2 }'
 execp_interval = 1
 execp_continuous = 1
 </code></pre>
diff --git a/doc/tint2.md b/doc/tint2.md
index 313f815..5b6b1b9 100644
--- a/doc/tint2.md
+++ b/doc/tint2.md
@@ -694,10 +694,11 @@ execp_markup = 1
 ##### Memory usage
 
 ```
+# "stdbuf -oL" noticed to give better performance than fflush() from awk code
 execp = new
-execp_command = free | awk '/^-/ { printf "Mem: '$(free -h | awk '/^Mem:/ { print $2 }')' %.0f%%\n", 100*$3/($3+$4); fflush(stdout) }'
-execp_interval = 5
-execp_continuous = 0
+execp_command = free -b -s1 | stdbuf -oL awk '/^Mem:/ { printf "Mem: %.1fGi %.0f%%\n", $2 / (2^30), 100 * ($2 - $7) / $2 }'
+execp_interval = 1
+execp_continuous = 1
 ```
 
 ##### Network load