How to determine what the garbage collector removes in chrome?

Question

JavaScript

With certain actions, I see this picture.

Sometimes it's a lot of points in 1-2 mb, sometimes three points in 15-20 mb.
But it's always a 3 second freeze.
In short, this is a list of 1000 complex house elements, sorted, filtered and grouped.
These cleanups happen when regrouping, but house elements are not removed/created, but moved from group to group.
I would like to optimize this place to get rid of the three-second freeze, but I can’t figure out what exactly the GC cleans.
The timeline does not show what is being cleaned there, but only the fact that gc is working.
I tried to make two Heap Snapshots in the profiler and compare them, but I could not figure out how to see what gc deleted, although I read the docs.
Please help with advice or instructions.