I like the idea of DDG and I have a strong dislike for Google but DDG is simply not there yet. Having said that it's better than it was five years ago, when it was simply insufferable. So, maybe in five years? ;)
Although I DO get frustrated by DDG's image search. Google's actually takes you to the actual image URL, so it's easier to get a link for sharing. DDG shows all images through their weird proxy thing, such that you can't easily get the raw URL.
It's hard to know for sure what's happening though. Maybe my searches are just very simple and don't need anything complex? Maybe I'm luckier and always have fast internet connections? Maybe it's some other factor I'm not thinking of? Who knows without trying to come up with a more systematic way to compare things.
They have a proxy (just like google) so they don't directly load the images you search for, they make their servers load the images and then send you a proxified version. If you search for obscure terms, they won't have a cached version available so they will have to request it from the actual server, and that makes all images take a while to load. On the other hand Google always keeps the images cached so they can serve them instantly.
Sometimes ddg results are even straight up better. Most of the time I use !g is when looking up location sensitive stuff, e.g. non-english local government stuff etc.
Also, I suggest using !s instead of !g so that you still get Google results without actually being redirected to Google.