for (var i = 0; i < repeater.count; i++) {...}

optimized:

for (var i = 0, n = repeater.count; i < n; i++) {...}

or:

                var bucketImage = brushImage_colorAnimation.bucketImage
                brushCanvas.color = brushImage_colorAnimation.color
                if (bucketImage.bucketCanvas)
                    bucketImage.bucketCanvas.color = brushImage_colorAnimation.color
                else if (bucketImage.color)
                    bucketImage.color = brushImage_colorAnimation.color

optimized:

                var bucketImage = brushImage_colorAnimation.bucketImage
                var color = brushImage_colorAnimation.color
                brushCanvas.color = color
                if (bucketImage.bucketCanvas)
                    bucketImage.bucketCanvas.color = color
                else if (bucketImage.color)
                    bucketImage.color = color

i.e. basically how fast is property get in QML JS?

Does it have any sense to excessively use local variables to cache things that definitely are not going to change?

Thanks!