JS GC / performance

HI, the question is about deleting object from weakMap.
Is better for performance to do nothing and let gc work or do this by myself at “finally” block?
When i do nothing, than gc must be call and find old data and delete, the alternative is… I decided that I don’t need this and just throw garbage no need to call gc.

And is this normal that few seconds after end of building app i have spam of
CC Graph Reduction and Cycle Collection.