apply gfx tweaks

user.js

@@ -20,6 +20,30 @@ user_pref("doh-rollout.home-region", "US");
 user_pref("extensions.pocket.enabled", false);
 user_pref("extensions.screenshots.disabled", true);
 
+// GFX
+// Based on <https://gist.github.com/RubenKelevra/fd66c2f856d703260ecdf0379c4f59db#gfx-rendering-tweaks>
+user_pref("gfx.canvas.accelerated", true);
+user_pref("gfx.canvas.accelerated.cache-items", 32768);
+user_pref("gfx.canvas.accelerated.cache-size", 4096);
+// user_pref("layers.acceleration.force-enabled", true);
+user_pref("gfx.content.skia-font-cache-size", 80);
+user_pref("gfx.webrender.all", true);
+user_pref("gfx.webrender.compositor", true);
+// user_pref("gfx.webrender.compositor.force-enabled", true);
+user_pref("gfx.webrender.enabled", true);
+user_pref("gfx.webrender.precache-shaders", true);
+user_pref("gfx.webrender.program-binary-disk", true);
+user_pref("gfx.webrender.software.opengl", true);
+user_pref("image.mem.decode_bytes_at_a_time", 65536);
+user_pref("image.mem.shared.unmap.min_expiration_ms", 120000);
+user_pref("layers.gpu-process.enabled", true);
+// user_pref("layers.gpu-process.force-enabled", true);
+user_pref("image.cache.size", 10485760);
+user_pref("media.memory_cache_max_size", 1048576);
+user_pref("media.memory_caches_combined_limit_kb", 3145728);
+// ser_pref("media.hardware-video-decoding.force-enabled", true);
+user_pref("media.ffmpeg.vaapi.enabled", true);
+
 // Misc
 user_pref("browser.cache.disk.parent_directory", "/run/user/1000/firefox"); // id -u <username>
 user_pref("browser.search.suggest.enabled.private", true);