Just a very simple suggestion of adding a form of feedback when you click "Download as: XLSX or CSV" within "Export data". Something as simple as a "This may take a few minutes.." text message would work but currently when you click it it can appear as if nothing is happening and looking in the bug section some users are affected by really long download times.
Personally the first time I used the extension I gave up and uninstalled it thinking it didn't work when absolutely nothing happened when I clicked to download and only seeing a message on this forum helped me to realise I needed to wait longer.
Thanks