Hi !
LayGridderLocation::get_select_view()
is pretty much querying every post on the wp and then inserting it in the DOM as an option for the LayGridder > Options > Location form".
<option value="1">Non classé</option>
a few options laters
<option value="40149">Comment ça marche ?</option>
With 45k posts the page was just failing to display without error bellow 1024Mo allowed to php memory.
So I might be testing this on the wrong type of website for layGridder but even with a few hundred that might be problematic.