Being a "slow learner" doesn't mean much, honestly. That's just learning style.
If yeu're very detail oriented and work out all the little kinks in a concept methodically one at a time, then yeu'll learn slowly, but thoroughly, which's more important.
Most of the "quick learners" catch onto basic points and concepts quickly but lack full understanding as a whole.
It's like... say a spider's web, we'll use this as an example:
The "quick learners" tend to grasp the key lines, like the outward support structures very fast, but are oblivious to the inner rings, leaving them with only really half an idea of whot is going on, and no true comprehension.
The 'slow learners' often are slow because they're being methodical, going through each ring one step at a time, carefully analyzing the patterns and how things work together. It takes them longer to get to the outer edges, but they generally have a better idea of the idea as a whole when they get there.
Problem is less in learning style, and moreso in issues with our society's obsessive compulsive need for speed.
Everything has to be fast. Now. Instant. Immediate. No time to pause and think, if yeu don't get something on the first pass yeu're a failure at life.
Obviously not the case... remember, einstein failed math class.
There's other 'learning disabilities' as well, which usually aren't even really disabilities to be honest... things like learning things in a particular way best, such as actively doing something. Showing someone a diagram of a car may be meaningless to them; let them under the hood and they'll learn twice as fast as anyone else. Yet that's deemed to be a disability because it doesn't match with how the current teaching process does things.
Honestly, I wouldn't worry about it too much, but if yeu really ARE concerned with being considered "slow", I'd suggest actively stressing understanding basic ideas and building on those, rather than trying to absorb all the information at once and then attempting to see the big picture from the start. That'll generally make yeu look like a faster learner, though chances are yeu won't have learned as much in the process so it's kind of a tradeoff.
The 'best' learners, really are just those who can switch back and forth and learn both the basics, and the things around them in turn quickly. If yeu stress too much on the details or the big picture, yeu'll get lost either way.
Unable to see the forest through the trees is as bad as being unable to see the trees through the forest type dealie.
But honestly, as long as yeu get there in the end, and it MAKES SENSE, then that's all that matters.
As far as I'm concerned, at least, someone who learns slowly but is able to grasp really high end complex concepts like theoretical physics, is smarter than someone who learned to tie their shoes a year sooner. Just because yeu learn 'faster', it doesn't mean yeu learned as much in the process.
There's exceptions of course, but I wouldn't worry about it too much.