diff --git a/data/helpers.d/logging b/data/helpers.d/logging
index 087cfc80c..e98285889 100644
--- a/data/helpers.d/logging
+++ b/data/helpers.d/logging
@@ -198,6 +198,13 @@ ynh_print_ON () {
 # Requires YunoHost version 3.?.? or higher.
 increment_progression=0
 previous_weight=0
+max_progression=-1
+# Set the scale of the progression bar
+# progress_string(0,1,2) should have the size of the scale.
+progress_scale=20
+progress_string2="####################"
+progress_string1="++++++++++++++++++++"
+progress_string0="...................."
 # Define base_time when the file is sourced
 base_time=$(date +%s)
 ynh_script_progression () {
@@ -218,54 +225,51 @@ ynh_script_progression () {
 	local exec_time=$(( $(date +%s) - $base_time ))
 	base_time=$(date +%s)
 
-	# Get the number of occurrences of 'ynh_script_progression' in the script. Except those are commented.
-	local helper_calls="$(grep --count "^[^#]*ynh_script_progression" $0)"
-	# Get the number of call with a weight value
-	local weight_calls=$(grep --perl-regexp --count "^[^#]*ynh_script_progression.*(--weight|-w )" $0)
+	# Compute $max_progression (if we didn't already)
+	if [ "$max_progression" = -1 ]
+	then
+		# Get the number of occurrences of 'ynh_script_progression' in the script. Except those are commented.
+		local helper_calls="$(grep --count "^[^#]*ynh_script_progression" $0)"
+		# Get the number of call with a weight value
+		local weight_calls=$(grep --perl-regexp --count "^[^#]*ynh_script_progression.*(--weight|-w )" $0)
 
-	# Get the weight of each occurrences of 'ynh_script_progression' in the script using --weight
-        local weight_valuesA="$(grep --perl-regexp "^[^#]*ynh_script_progression.*--weight" $0 | sed 's/.*--weight[= ]\([[:digit:]]*\).*/\1/g')"
-        # Get the weight of each occurrences of 'ynh_script_progression' in the script using -w
-        local weight_valuesB="$(grep --perl-regexp "^[^#]*ynh_script_progression.*-w " $0 | sed 's/.*-w[= ]\([[:digit:]]*\).*/\1/g')"
-	# Each value will be on a different line.
-	# Remove each 'end of line' and replace it by a '+' to sum the values.
-	local weight_values=$(( $(echo "$weight_valuesA" | tr '\n' '+') + $(echo "$weight_valuesB" | tr '\n' '+') 0 ))
+		# Get the weight of each occurrences of 'ynh_script_progression' in the script using --weight
+		local weight_valuesA="$(grep --perl-regexp "^[^#]*ynh_script_progression.*--weight" $0 | sed 's/.*--weight[= ]\([[:digit:]]*\).*/\1/g')"
+		# Get the weight of each occurrences of 'ynh_script_progression' in the script using -w
+		local weight_valuesB="$(grep --perl-regexp "^[^#]*ynh_script_progression.*-w " $0 | sed 's/.*-w[= ]\([[:digit:]]*\).*/\1/g')"
+		# Each value will be on a different line.
+		# Remove each 'end of line' and replace it by a '+' to sum the values.
+		local weight_values=$(( $(echo "$weight_valuesA" | tr '\n' '+') + $(echo "$weight_valuesB" | tr '\n' '+') 0 ))
 
-	# max_progression is a total number of calls to this helper.
-	#    Less the number of calls with a weight value.
-	#    Plus the total of weight values
-	local max_progression=$(( $helper_calls - $weight_calls + $weight_values ))
+		# max_progression is a total number of calls to this helper.
+		# 	Less the number of calls with a weight value.
+		# 	Plus the total of weight values
+		max_progression=$(( $helper_calls - $weight_calls + $weight_values ))
+	fi
 
 	# Increment each execution of ynh_script_progression in this script by the weight of the previous call.
 	increment_progression=$(( $increment_progression + $previous_weight ))
 	# Store the weight of the current call in $previous_weight for next call
 	previous_weight=$weight
 
-	# Set the scale of the progression bar
-	local scale=20
-	# progress_string(0,1,2) should have the size of the scale.
-	local progress_string2="####################"
-	local progress_string1="++++++++++++++++++++"
-	local progress_string0="...................."
-
 	# Reduce $increment_progression to the size of the scale
 	if [ $last -eq 0 ]
 	then
-		local effective_progression=$(( $increment_progression * $scale / $max_progression ))
+		local effective_progression=$(( $increment_progression * $progress_scale / $max_progression ))
 	# If last is specified, fill immediately the progression_bar
 	else
-		local effective_progression=$scale
+		local effective_progression=$progress_scale
 	fi
 
 	# Build $progression_bar from progress_string(0,1,2) according to $effective_progression and the weight of the current task
 	# expected_progression is the progression expected after the current task
-	local expected_progression="$(( ( $increment_progression + $weight ) * $scale / $max_progression - $effective_progression ))"
+	local expected_progression="$(( ( $increment_progression + $weight ) * $progress_scale / $max_progression - $effective_progression ))"
 	if [ $last -eq 1 ]
 	then
 		expected_progression=0
 	fi
 	# left_progression is the progression not yet done
-	local left_progression="$(( $scale - $effective_progression - $expected_progression ))"
+	local left_progression="$(( $progress_scale - $effective_progression - $expected_progression ))"
 	# Build the progression bar with $effective_progression, work done, $expected_progression, current work and $left_progression, work to be done.
 	local progression_bar="${progress_string2:0:$effective_progression}${progress_string1:0:$expected_progression}${progress_string0:0:$left_progression}"