I use them (almost more then 10 years) and I never had any issue with. And in every project there are one or more component of Jedi (visual and not visual). I always use the github version https://github.com/project-jedi
TClientDataSet is pretty fast. Faster than FireDAC.
You should reduce filtering and sorting if this is a bottleneck. Consider using CloneCursor if you need same sorting or filtering many times.
But first: use a profiler!
I know that GExperts can cause this. Unfortunately I so far was unable to find the actual problem. It seems to be connected with using the formatter very frequently.
Most often this happens if you use third-party components. Try uninstalling add-ons (such as those installed by GETIT) one at a time to find which one might be generating the AV (assuming it depends on the added components).