[Linux] Start using compton

dotfiles/config/compton.conf

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+#################################
+#
+# Backend
+#
+#################################
+
+# Backend to use: "xrender" or "glx".
+# GLX backend is typically much faster but depends on a sane driver.
+backend = "glx";
+
+#################################
+#
+# GLX backend
+#
+#################################
+
+glx-no-stencil = true;
+
+# GLX backend: Copy unmodified regions from front buffer instead of redrawing them all.
+# My tests with nvidia-drivers show a 10% decrease in performance when the whole screen is modified,
+# but a 20% increase when only 1/4 is.
+# My tests on nouveau show terrible slowdown.
+# Useful with --glx-swap-method, as well.
+glx-copy-from-front = false;
+
+# GLX backend: Use MESA_copy_sub_buffer to do partial screen update.
+# My tests on nouveau shows a 200% performance boost when only 1/4 of the screen is updated.
+# May break VSync and is not available on some drivers.
+# Overrides --glx-copy-from-front.
+# glx-use-copysubbuffermesa = true;
+
+# GLX backend: Avoid rebinding pixmap on window damage.
+# Probably could improve performance on rapid window content changes, but is known to break things on some drivers (LLVMpipe).
+# Recommended if it works.
+# glx-no-rebind-pixmap = true;
+
+
+# GLX backend: GLX buffer swap method we assume.
+# Could be undefined (0), copy (1), exchange (2), 3-6, or buffer-age (-1).
+# undefined is the slowest and the safest, and the default value.
+# copy is fastest, but may fail on some drivers,
+# 2-6 are gradually slower but safer (6 is still faster than 0).
+# Usually, double buffer means 2, triple buffer means 3.
+# buffer-age means auto-detect using GLX_EXT_buffer_age, supported by some drivers.
+# Useless with --glx-use-copysubbuffermesa.
+# Partially breaks --resize-damage.
+# Defaults to undefined.
+glx-swap-method = "undefined";
+
+#################################
+#
+# Shadows
+#
+#################################
+
+# Enabled client-side shadows on windows.
+shadow = true;
+# Don't draw shadows on DND windows.
+no-dnd-shadow = true;
+# Avoid drawing shadows on dock/panel windows.
+no-dock-shadow = true;
+# Zero the part of the shadow's mask behind the window. Fix some weirdness with ARGB windows.
+clear-shadow = true;
+# The blur radius for shadows. (default 12)
+shadow-radius = 5;
+# The left offset for shadows. (default -15)
+shadow-offset-x = -5;
+# The top offset for shadows. (default -15)
+shadow-offset-y = -5;
+# The translucency for shadows. (default .75)
+shadow-opacity = 0.5;
+
+# Set if you want different colour shadows
+# shadow-red = 0.0;
+# shadow-green = 0.0;
+# shadow-blue = 0.0;

dotfiles/config/systemd/user/compton.service

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+[Unit]
+Description=compton
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/compton -cC
+ExecStop=/usr/bin/pkill compton
+
+[Install]
+WantedBy=wm.target