diff --git a/dotfiles/zshrc b/dotfiles/zshrc
index e4269d4..d76d5a4 100644
--- a/dotfiles/zshrc
+++ b/dotfiles/zshrc
@@ -47,6 +47,9 @@ if [[ "$OSTYPE" =~ ^linux.*$ ]]; then
     export SDL_VIDEODRIVER=wayland
     # Signal to xdg-desktop-portal that we're on Sway
     export XDG_CURRENT_DESKTOP=sway
+    # 2022-12-26: use Vulkan renderer in Sway
+    # 2023-01-03: a bit buggy on older Intel, especially in Thunderbird (even on new Intel)
+    #export WLR_RENDERER=vulkan
 
     # 2023-02-05: tell pip/poetry not to probe for keyrings. I'm not publishing
     # packages to pypi.org and the popup during pip/poetry install is annoying.