Leaflet big GeoJson file Ajax filter best performance

I have four 2MB geoJson files with four Layer to load like

LayerBoon = L.geoJSON.ajax(URL, {pointToLayer:returnBoonMarker, filter:filtertext}); 

with a filter function and this button click function

$("#btnFindText").click(function(){
    SeachTXT = $("#txtFind").val();
    LayerSt.refresh();
    LayerPr.refresh();
    LayerHL.refresh();
    LayerBoon.refresh();
})

every Layer have to re-filter by clicking the button.

when filtering, is it possible not to reload the file each time, keep it in cache and filter it again?

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