My experience with CLion was that it was agonizingly slow to do anything. It stuttered scrolling through even a small C project. I don't know exactly what it was doing in the background, but it constantly had fans running. Long after it made sense for it to be indexing.
In fairness, though, this was probably four or five years ago. But it sure colored my opinion of the software.
Randomly clicked on some of the provided links:
One was an acknowledged bug that was fixed in .1 version.
Another one doesn't specify what hardware do they have.
Like I said, stop using computers from 20 years ago and let the indexer do its thing. Since the navigation in Jetbrains products is so good it takes a while for the indexer to index everything especially in large projects.
I was just using a macbook air (with Intel 2 cores cpu) with android studio with both java and c++ code. Not a huge project but it was over 100k of code. It worked just fine. No stuttering when scrolling. I don't remember having that problem in ANY ide for the past decade, not just Jetbrains.
In fairness, though, this was probably four or five years ago. But it sure colored my opinion of the software.
Also this isn't exactly unheard of as you seem to think. It even necessitated a support article: https://www.jetbrains.com/help/clion/performance-tuning-tips...
But a quick Google search reveals that OP isn't a "zealot" making things up. Here, I did some work for you:
https://intellij-support.jetbrains.com/hc/en-us/community/po...
https://intellij-support.jetbrains.com/hc/en-us/community/po...
https://intellij-support.jetbrains.com/hc/en-us/community/po...
https://www.reddit.com/r/cpp/comments/n84wzh/why_do_people_s...
https://news.ycombinator.com/item?id=21797145