nwg-drawer: Drawer becomes unresponsive for some inputs

I’m using nwg-drawer 0.2.8 on NxOS 22.05.

How to reproduce

1. Use NixOS?
2. Install Tor Browser.
3. Launch nwg-drawer, start typing tor-

In my setup, the program just freezes and freezes my entire Sway desktop. If I hit Escape, the nwg-drawer exits and my desktop is back to normal after some time (around 10 s).

I don’t know why Tor Browser in particular triggers this behavior. I have also noticed that nwg-drawer is not very responsive in general. Response to keypresses takes always takes at least half a second.

nwg-drawer output:

time="2022-08-03T23:50:40+02:00" level=info msg="term: foot"
time="2022-08-03T23:50:40+02:00" level=info msg="lang: fr_FR"
time="2022-08-03T23:50:40+02:00" level=info msg="Config dir: /home/olivier/.config/nwg-drawer"
time="2022-08-03T23:50:40+02:00" level=info msg="Copying file: /home/olivier/.config/nwg-drawer/drawer.css"
time="2022-08-03T23:50:40+02:00" level=info msg="Found 0 pinned items"
time="2022-08-03T23:50:40+02:00" level=info msg="Found 136 desktop files"
time="2022-08-03T23:50:40+02:00" level=info msg="Skipped 3 duplicates; 46 .desktop entries hidden by \"NoDisplay=true\""
time="2022-08-03T23:50:40+02:00" level=info msg="/home/olivier/.config/nwg-drawer/preferred-apps.json file not found"
time="2022-08-03T23:50:40+02:00" level=info msg="/home/olivier/.config/nwg-drawer/excluded-dirs file not found"

(nwg-drawer:2624720): dbind-WARNING **: 23:50:40.107: AT-SPI: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files
time="2022-08-03T23:50:40+02:00" level=error msg="ERROR: /home/olivier/.config/nwg-drawer/drawer.css css file not found or erroneous. Using GTK styling."
time="2022-08-03T23:50:40+02:00" level=error msg="<broken file>:1:0Failed to import: Erreur lors de l’ouverture du fichier /home/olivier/.config/nwg-drawer/drawer.css\u00a0: No such file or directory"
time="2022-08-03T23:50:40+02:00" level=warning msg="Undefined icon for "

(nwg-drawer:2624720): Gtk-WARNING **: 23:50:40.370: Found an icon but could not load it. Most likely gdk-pixbuf does not provide SVG support.
time="2022-08-03T23:50:40+02:00" level=info msg="Using XDG user dirs from /home/olivier/.config/user-dirs.dirs"

** (nwg-drawer:2624720): WARNING **: 23:50:40.431: gtk-layer-shell v0.6.0 may not work on GTK v3.24.34. If you experience crashes, check https://github.com/wmww/gtk-layer-shell/blob/master/compatibility.md
time="2022-08-03T23:50:40+02:00" level=info msg="UI created in 390 ms. Thank you for your patience."
time="2022-08-03T23:50:44+02:00" level=warning msg="Undefined icon for "
time="2022-08-03T23:50:46+02:00" level=warning msg="Undefined icon for "
time="2022-08-03T23:50:46+02:00" level=warning msg="Undefined icon for "
time="2022-08-03T23:51:08+02:00" level=warning msg="Undefined icon for "