diff --git a/aoclib/__init__.py b/aoclib/__init__.py
index 8698e18..ac74de9 100644
--- a/aoclib/__init__.py
+++ b/aoclib/__init__.py
@@ -1,2 +1,3 @@
 from .inputs import *
 from .output import *
+from .performance import *
diff --git a/aoclib/performance.py b/aoclib/performance.py
new file mode 100644
index 0000000..48428d3
--- /dev/null
+++ b/aoclib/performance.py
@@ -0,0 +1,13 @@
+import time
+
+
+def print_execution_time(func):
+    def wrapper(*args, **kwargs):
+        time_start = time.time()
+        return_value = func(*args, **kwargs)
+        time_stop = time.time()
+        print('{:s} function took {:.3f}ms'.format(func.__name__, (time_stop - time_start) * 1000.0))
+
+        return return_value
+
+    return wrapper
diff --git a/day01.py b/day01.py
index 521c24c..94e0c83 100755
--- a/day01.py
+++ b/day01.py
@@ -17,11 +17,13 @@ def getProductOf2020Sum(input_lines, combinations):
     return return_value
 
 
+@aoclib.print_execution_time
 def part1(test_mode=False):
     my_input = aoclib.getInputAsArray(day=1, return_type=int, test=test_mode)
     return getProductOf2020Sum(my_input, 2)
 
 
+@aoclib.print_execution_time
 def part2(test_mode=False):
     my_input = aoclib.getInputAsArray(day=1, return_type=int, test=test_mode)
     return getProductOf2020Sum(my_input, 3)
diff --git a/day02.py b/day02.py
index 08c215b..20f60ee 100755
--- a/day02.py
+++ b/day02.py
@@ -6,6 +6,7 @@ DAY = 2
 splitter = re.compile(r'([0-9]+)-([0-9]+) ([a-z]): (.*)')
 
 
+@aoclib.print_execution_time
 def part1(test_mode=False):
     my_input = aoclib.getInputAsArray(day=2, test=test_mode)
     valid_count = 0
@@ -18,6 +19,7 @@ def part1(test_mode=False):
     return valid_count
 
 
+@aoclib.print_execution_time
 def part2(test_mode=False):
     my_input = aoclib.getInputAsArray(day=2, test=test_mode)
     valid_count = 0
diff --git a/day03.py b/day03.py
index 78a6344..9dd89e9 100755
--- a/day03.py
+++ b/day03.py
@@ -19,11 +19,13 @@ def check_for_trees(right_step, down_step, treelines):
     return tree_count
 
 
+@aoclib.print_execution_time
 def part1(test_mode=False):
     my_input = aoclib.getInputAsArray(day=3, test=test_mode)
     return check_for_trees(3, 1, my_input)
 
 
+@aoclib.print_execution_time
 def part2(test_mode=False):
     my_input = aoclib.getInputAsArray(day=3, test=test_mode)
     tree_count1 = check_for_trees(1, 1, my_input)
diff --git a/day04.py b/day04.py
index 1d32c4c..0d54555 100644
--- a/day04.py
+++ b/day04.py
@@ -70,6 +70,7 @@ def verifyPassportData(passport_data, verify_data=False):
     return True
 
 
+@aoclib.print_execution_time
 def part1(test_mode=False):
     valid = 0
     for passport_line in aoclib.getMultiLineInputAsArray(day=4, test=test_mode):
@@ -80,6 +81,7 @@ def part1(test_mode=False):
     return valid
 
 
+@aoclib.print_execution_time
 def part2(test_mode=False):
     valid = 0
     for passport_line in aoclib.getMultiLineInputAsArray(day=4, test=test_mode):
diff --git a/day05.py b/day05.py
index 0e73526..857ce75 100644
--- a/day05.py
+++ b/day05.py
@@ -2,6 +2,8 @@
 import aoclib
 
 DAY = 5
+rows_predefined = list(range(0, 128))
+columns_predefined = list(range(0, 8))
 
 
 def getSeatRowColumn(seat_string):
@@ -11,7 +13,7 @@ def getSeatRowColumn(seat_string):
     row_string = seat_string[:7]
     column_string = seat_string[-3:]
 
-    rows = list(range(0, 128))
+    rows = rows_predefined.copy()
     for row_char in row_string:
         if row_char == 'F':
             rows = rows[:int(len(rows) / 2)]
@@ -21,7 +23,7 @@ def getSeatRowColumn(seat_string):
     if len(rows) > 1:
         raise ValueError('left with more than one row: %s' % rows)
 
-    columns = list(range(0, 8))
+    columns = columns_predefined.copy()
     for column_char in column_string:
         if column_char == 'L':
             columns = columns[:int(len(columns) / 2)]
@@ -38,6 +40,7 @@ def getSeatID(row, column):
     return row * 8 + column
 
 
+@aoclib.print_execution_time
 def part1(test_mode=False):
     my_input = aoclib.getInputAsArray(day=5, test=test_mode)
     max_id = 0
@@ -48,6 +51,7 @@ def part1(test_mode=False):
     return max_id
 
 
+@aoclib.print_execution_time
 def part2(test_mode=False):
     my_input = aoclib.getInputAsArray(day=5, test=test_mode)
     seat_list = list(range(0, 1024))