The issues I have when trying to go faster are
Not enough scrubbing so leave the odd mark thats not removed. I see people making one pass but my windows don't seem to be like that, there's nearly always some pollen, bird muck or something that requires extra scrubbing.
Not enough rinsing, all seems good then when you check after there's bits you haven't rinsed off
Sills not clean, with a quick swipe over it usually dislodges muck from under the gap. Takes a bit of rinsing or wipe with a cloth.
Perhaps the issue is I like mine to be perfect I just can't bring myself to do it half assed which is what I would feel like I was doing dashing round with a quick swipe of the glass rinsing on and a quick swipe of the sill.
OR maybe I am as fast as you Nathan perhaps it's that I don't have the compact work you have. I have next to nothing on the same street.
The points you raise are interesting, how long have you n wife been doing this??
Like i said im not doing anything special, but ive been doing it long enough to know virtually each house I do. New customers houses may take a little longer till I get to know them but yes all but 2% of my work is compact which certainly helps ☺
But going back to your concerns, my brush is dual trimmed and short stiff bristles which give good scrubbing and good contact on the window. Its the tips of the monofilaments that does the work thats why i dont like brushes which spread open with the slightest contact on the glass.
Ive learnt not to look through the glass but look at the glass and especially on downstairs work you should be able to see the marks that need scrubbing if your paying attention even when going a little faster. Even on this vid you can see me scub in places where its needed.
Rinsing, i have 6 jets with good flow, and i mean good flow. Again i know my houses and i perhaps have 20 - 25 houses in my entire round which are hydrophobic.
I hate sills where the slightest bit of water gets undrneath and a tonne of dirt comes out. So i deal with it! May take a little longer on first couple of cleans but with 6 or 4 jets i had before, you can aim the jets underneath at an angle and flush all the crap out making later cleans easier.
But peolle need to film them selves its liberating and they may be suprised with what they find out about their own technique or even physically see what the time print is how fast they take!