Hi ThrivingWind.
Many people have experiences similar to yours. In fact, even though I've been working in the GMAT space for years, not too long ago, I read a GMAT RC passage and found it challenging to process.
So, what's to be done?
The thing is to realize that, whereas much of what we read is written to be as easy as possible to understand, GMAT passages are not written with the intention of making them easy to read. So, when we read GMAT passages, we may get confused in ways we're not used to.
Accordingly, a key GMAT skill we need to develop is skill in digging in and unconfusing ourselves. In other words, we have to develop skill in not being surprised that we're having difficulty reading a passage and doing whatever we have to do to understand it, even if that means reading if a handful of words at a time.
So, when you're practicing GMAT verbal, don't worry too much about the time you spend on each question. Rather, take all the time you need to learn to understand the passages and arrive at correct answers. In other words, take your time and learn to go through the motions that lead to success.
For some more tips that could help you master RC and other aspects of GMAT verbal, see this post.
How to Score High on GMAT Verbal