perfomanceWithOrWithoutBoundsCheck.py

import pyclipper
from booleanOperations.booleanOperationManager import _addContour, _operationMap, _fillTypeMap

def clipExecute(subjectContours, clipContours, operation, subjectFillType="nonZero",
                clipFillType="nonZero", addBoundsTest=True):
    pc = pyclipper.Pyclipper()

    for i, subjectContour in enumerate(subjectContours):
        _addContour(clipperPath=pc, contour=subjectContour, fillType=pyclipper.PT_SUBJECT, contourCount=i)

    for j, clipContour in enumerate(clipContours):
        _addContour(clipperPath=pc, contour=clipContour, fillType=pyclipper.PT_CLIP, contourCount=i)
    
    if addBoundsTest:
        bounds = pc.GetBounds()
        if (bounds.bottom, bounds.left, bounds.top, bounds.right) == (0, 0, 0, 0):
            # do nothing if there are no paths
            return []

    try:
        solution = pc.Execute(_operationMap[operation],
                              _fillTypeMap[subjectFillType],
                              _fillTypeMap[clipFillType])
    except pyclipper.ClipperException as exc:
        raise ExecutionError(exc)

    return [[tuple(p) for p in path] for path in solution]



glyph = CurrentGlyph()

subjectContours = []
for contour in glyph:
    subjectContours.append([(p.x, p.y) for p in contour.points])
    r = pyclipper.Area(subjectContours[-1])


import timeit
NUMBER = 1000

def bounds():
    clipExecute(subjectContours, [], "union")

r = timeit.Timer(bounds).timeit(number=NUMBER)
print(r)

def nobounds():
    clipExecute(subjectContours, [], "union", addBoundsTest=False)

r = timeit.Timer(nobounds).timeit(number=NUMBER)
print(r)