Own an Apple TV? I changed 12 settings to instantly make the system run like new again

Do I suffer retired connected HDR by forcing 4K SDR?

No -- not if you support Match Content enabled, anyway. The 4K SDR format mounting prevents unnecessary switching connected menus and SDR content, but genuine HDR streams inactive show successful afloat HDR erstwhile available.

Can my TV adjacent grip 4:4:4 Chroma?

It's worthy testing. Connect a prime HDMI cablegram and power to 4:4:4. Look for wide substance and crisp edges erstwhile displaying contented with good details oregon text. If substance appears blurry oregon jagged connected the edges, oregon if you announcement immoderate flicker oregon dropouts, revert to 4:2:0.

How often should I recalibrate colour balance?

Once oregon doubly a year, oregon aft large tvOS updates, is fine. Your colour accuracy does alteration implicit time, truthful it's worthy recalibrating.

How bash I wide the cache connected my Apple TV?

Your Apple TV doesn't connection a circumstantial "clear cache" enactment similar immoderate different devices, arsenic TVOS is designed to negociate cache automatically. You tin inactive manually delete oregon offload apps, though, if you privation to amended negociate your disposable retention space.