The time when bug 1377321 merged I saw a notable delay when opening uBlock Origin on my KDE/X11/Debian Testing/Radeon RX480 desktop. Today, the delay is almost not noticable on KDE/X11/Debian Testing/Intel Iris 6100 (Broadwell GT3) laptop, but compared to the main menu it's still possible to close a panel before it has shown, by double clicking on its button. Using WR for main menu and context menu should still be fine.
Bug 1574746 Comment 12 Edit History
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The time when bug 1377321 merged I saw a notable delay when opening uBlock Origin on my KDE/X11/Debian Testing/Radeon RX480 desktop. Today, the delay is almost not noticeable on KDE/X11/Debian Testing/Intel Iris 6100 (Broadwell GT3) laptop, but compared to the main menu it's still possible to close a panel before it has shown, by double clicking on its button. Using WR for main menu and context menu should still be fine.
The time when bug 1377321 merged I saw a notable delay when opening uBlock Origin on my KDE/X11/Debian Testing/Radeon RX480 desktop. Today, the delay is almost not noticeable on my KDE/X11/Debian Testing/Intel Iris 6100 (Broadwell GT3) laptop, but compared to the main menu it's still possible to close a panel before it has shown, by double clicking on its button. Using WR for main menu and context menu should still be fine.