entry completion for hundreds of thousands of items

Hi,

I want to provide some completion for text where the corpus of items is
above 100000. I've tried to build a GTree.list_store with those 100000 items
but it takes a too long time to build the model. I've then tried to
split those 100 000 iterms
in chunk of 1000 based on common prefix.  Then as the user start to
type a string, I build a model
with only the relevant 1000 items. But even building a model with only
1000 items takes more than 2 seconds
which makes the whole application look slow. Is there a way to
accelerate the insertion of items
in a list_store ?

I've attached my modification of src/examples/entrycompletion.ml
showing how slow it is.

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