Cannot edit photos in the latest version

Hi

In the old version of photos i could edit, to a degree lol, i could use the retouch and chose the size of the circle to what i need it for, i have attached a pic so you know what i am on about, i would use the large circle to turn the backing a nice smooth looking surface by removing all the imperfections, it worked really fast immediately actually and i could do the same with the nail by using a smaller circle, yet since installing the latest update for photos it takes such a long time, i can wait for 10 minutes just to smooth 1 inch of the page, then when i click done, because i am fed up of not being able to make any adjustments, i quite photos and it takes ages to quit, also when in photos editing my fan on my MacBook pro starts up ??????, can anybody shed any light on why this happens can tell me how to edit my photo without wanting to launch my mac across the room please.

Thanking you in advance

Tracey xx