diff --git a/TODO.md b/TODO.md
index f8be3d6..e4daf1f 100644
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+++ b/TODO.md
@@ -1,9 +1,22 @@
 - [x] add miruro streaming support
 - [x] investigate and fix audio when streaming from miruro - audio seems to crackle (not for youtube i think; only for miruros)
-- [ ] add chrome cast support — implemented; verify playback, captions and A/V sync on a physical Cast device
+- [x] add chrome cast support — implemented; verify playback, captions and A/V sync on a physical Cast device
 	- [x] fix premature receiver-launch timeout: reports failure even though Chromecast subsequently connects and playback works
 	- [x] fix TV volume slider jitter: receiver updates appear to compete with local volume adjustments
 	- [x] investigate and reduce slow buffering after seeking in YouTube videos while casting, compared with local playback — reuse probed inputs and cache completed segments; confirm perceived improvement on TV
 	- [x] fix Miruro Cast upstream overfetch: select HLS streams and share bounded video/audio packet buffering — verify sustained playback on TV
-- [ ] in the "choose what to play" screen, we should change the youtube button general streaming
-	- we can figure out the stream and how to handle it from the url (i.e. if youtube url, handle as youtube stream; if miruro url, handle accordingly)
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+- [ ] styling/ui changes:
+	- move the captions button in the controls left of the compact mode icon
+	- move the chrome cast button from the top-right container to the controls left of the captions button (that is, it's new position)
+	- don't leave and empty spot where the captions were supposed to be if captions aren't available; buttons should be moved over in that case.
+	- the background is currently black in the player when casting (chrome cast), but we should follow the design language of the rest of the app.
+	- replace the current chrome cast icon with the apple tv casting icon.
+- [ ] in the "choose what to play" screen, we should change the youtube button to general streaming
+	- we can figure out the stream and how to handle it from the url (i.e. if youtube url, handle as youtube stream; if miruro url, handle accordingly)
+- [ ] evaluate playback optimization opportunities for YouTube and Miruro — measure benefits before changing behavior
+	- [ ] coalesce superseded, not-yet-started seeks in the player and Cast controls; preserve accumulated relative skips and play/pause ordering
+	- [ ] expand Cast H.264/AAC remux coverage with keyframe-aligned segments; preserve seek accuracy, timestamps and receiver compatibility
+	- [ ] reuse decoder/encoder state during sequential Cast playback; reset on random seeks and preserve independent keyframes and AAC continuity
+	- [ ] evaluate VideoToolbox hardware video decoding for native and Cast playback; retain software fallback for unsupported formats
+	- [ ] benchmark cold start, cached/uncached seeks and sustained playback separately to prioritize the actual bottlenecks
+	- do not enable Miruro HTTP persistence without preserving origin/header checks, or increase caches/shorten Cast segments without measuring the memory/request/codec tradeoffs
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