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The match looked sharp, the ball easy to follow. Then the film began, and a candlelit costume drama suddenly looked like a daytime soap. Same TV, same setting. That setting is motion smoothing, and whether it is a friend or a villain depends on what is on screen.

Why does motion smoothing wreck films but sometimes help sport?

Motion smoothing invents extra frames between real ones, which is why it can make a 24 fps film look like a live broadcast while making fast live action easier to follow. RTINGS, whose motion-interpolation page was last modified in March 2026, calls it an optional feature TVs use to increase the frame rate of content. A guess between two real pictures helps when a camera whips across a pitch, and hurts when a director chose 24 frames a second on purpose.

Samsung's support page (dated July 2025 in its metadata) says smoothing suits live content such as sports, which it says is shot at 30 fps, while 24 fps movies are not meant for it and can pick up the soap opera effect. We trust the film half. The sport half is a vendor's preference worth testing.

Filmmaker Mode is the usual shortcut. Audioholics reported the UHD Alliance programme in November 2019 as switching off post-processing, including smoothing and noise reduction, and keeping the filmmaker's frame rate; Sony said it sets its own standards. That was 2019, so check your set. If it looks dim, see Filmmaker Mode looking too dark, and note that picture mode also sets what the set draws from the wall.

Four numbers decide how smoothing behaves in your room; one rests on an assumed delay you should replace with your own.

The ratio is the one a spec sheet never shows you. A 60 Hz panel cannot divide a film's frames evenly, so it alternates long and short holds, and that alternation, not smoothing, is the stutter on slow pans.

Which setting fits which screen time?

The right setting depends on what is on screen and whether your thumbs are on a controller, so the rule is per content type, not per TV. Try this sum: divide your panel's refresh rate by 24, the frame rate of film. A whole answer (120 Hz gives 5) means even holds; a trailing .5 means alternating long and short ones.

Worked example: a 60 Hz TV showing a 24 fps film, using the 3:2 pull-down on LG's support page (June 2024). One refresh lasts 1000 / 60 = 16.7 ms. Frames held three refreshes stay up 50 ms, those held two stay up 33.3 ms, and an even rhythm would give 41.7 ms (1000 / 24). That 16.7 ms gap between neighbours is the stutter, and smoothing off does not remove it. For a console, assume 50 ms of added delay at 60 fps (our placeholder, not a measurement): 50 x 60 / 1000 = 3.0 frames late. By our reasoning the delay cannot fall below one source frame, about 16.7 ms at 60 fps, since the TV needs the next frame before drawing the one between.

Cadence and lag on your TVPick your panel, the content and your game's frame rate, then set the lag to your own TV's number.

Your numbers

Panel refresh

60 Hz120 Hz144 Hz

Content frame rate

24 fps film25 fps30 fps60 fps

Added processing lag, ms

50

0100

Game frame rate

30 fps60 fps120 fps

Even hold per frame

41.7 ms

Longest hold

50.0 ms

Shortest hold

33.3 ms

Lag in frames

3.0 frames

Frames alternate between 50.0 ms and 33.3 ms, the uneven rhythm smoothing tries to hide. At 3.0 frames of lag, keep it off for games.Reset to the article's exampleSliders need JavaScript. Figures shown are the article's example.Hold times use refresh divided by frame rate and the 3:2 pull-down in LG's support page (June 2024). The 50 ms lag is our placeholder, not a lab figure.

The table turns the arithmetic and the vendor pages into five situations, each action with its reason beside it.

Row three's lag is a placeholder until you set the calculator to your own set. Whether cleaner pans are worth a faintly artificial ball is taste, and no support page settles it.

What goes wrong when you change the setting?

Switching smoothing off is not a cure-all: it leaves the 60 Hz stutter in place, an update can undo it, and every brand hides and names the control differently.

The update risk is documented. In June 2024, TechRadar reported that Roku OS 13 had turned on Roku's Action Smoothing for some users, including owners of TCL sets, and that some could not switch it off. One poster on Roku's community forum wrote: "We need the option to roll back to the software version before the Smart Picture update." That is one undated forum voice, not a statistic. A stick is one answer, weighed in smart TV updates versus a streaming stick.

Names are the other trap. Roku's support page, updated 24 June 2026, advises Low or Off for movies and warns that High can cause odd motion or ghosting, so a set shipped on High needs lowering, not returning. The control sits in Expert settings and may be named differently on partner TVs.

As of November 2026, the vendor pages put the control here:

• Samsung: Settings, Picture, Expert Settings, Auto Motion Plus Settings; Auto, Off or Custom (page dated July 2025).
• LG: Picture Options, TruMotion; Smooth, Clear, Clear Plus or User; options differ by picture mode (page dated June 2024).
• Sony: Motionflow, Off or Custom; the path varies by software version and not every model adjusts it (page modified June 2026).
• Roku: Star button, Picture settings, Customize Picture, Expert settings, Action Smoothing (page updated June 2026).

The decision is per content type, not per TV: films and games off, live sport on the lowest setting for a trial. This week, watch the same ten minutes of a match twice, once on each setting, and keep whichever the room prefers.

Fourth night of a new series in 4K, lights off, and a phone on the sofa arm lights up: Xfinity says the house is near its monthly data limit. Nobody downloaded anything unusual. The TV did it, one evening at a time, and that is the side of 4K streaming data usage no spec sheet mentions. The picture costs nothing to look at. The month it eats does.

Why does 4K streaming data usage hit a cap so fast?

4K hits a cap fast because each stream draws several gigabytes every hour it plays, and a monthly cap counts every one of those hours, so an ordinary evening habit nears a terabyte.

Netflix's help page (read 30 October 2026) puts HD at up to 3 GB an hour and standard definition at 1 GB, per device. Two TVs in 4K are two meters running, not one stream shared.

Xfinity's page, updated 31 August 2026, says the 1.2 TB limit now covers only older, legacy plans; newer plans include unlimited data. So first ask whether you are metered at all.

It is the per-hour sum we ran on what each picture mode and standby add to a TV's yearly electricity bill, with a different meter. If your 4K comes through a stick, quality is set inside each app, which matters more once smart TV software updates stop and a streaming stick takes over.

Four numbers decide whether a capped house copes. Netflix's help pages supply the hourly volume and the speed it asks for 4K; the time and cost cards are our division of those against Xfinity's overage terms.

The speed card is the one people misread. An hour at that rate moves about 6.75 GB, close to Netflix's hourly figure. A faster tier lets more screens play at once; it does nothing for the month.

How many hours of 4K fit in a 1.2 TB month?

On its own, one 4K TV running Netflix gets about 171 hours from a 1.2 TB month, but every phone and second screen in the house draws from the same pool, so your real figure is lower.

Worked example: a legacy-plan house runs one 4K TV four hours a night, a bedroom TV in HD two hours a day, and 250 GB a month of phones and laptops (assumed; your meter has the real figure). The 4K TV uses 4 × 7 × 30 = 840 GB. The bedroom set uses 2 × 3 × 30 = 180 GB. Add the 250 GB and the month ends at 1,270 GB, which is 70 GB over. Xfinity bills by 50 GB block, and assuming a part block counts whole, that is two blocks: $20, or nothing in the courtesy month.

Will your house go over 1.2 TB?Set your 4K hours, the second screen and everything else the house uses. The figures show your month and any overage.

Your numbers

4K hours a day

4.0

0.08.04K data rate, GB an hour

7.0

3.015.0Second screen hours a day

2.0

0.08.0Everything else, GB a month

250 GB

50 GB600 GBSecond screen on Medium

Your month

1,270 GB

Your cap

1,200 GB

Overage after courtesy month

$20

4K hours left under cap

0

You would pay $20 in a month that is not your courtesy month. Try the second screen on Medium first.Reset to the article's exampleSliders need JavaScript. Figures shown are the article's example.Rates from Netflix Help (4K up to 7 GB, HD up to 3 GB, Medium up to 0.7 GB an hour per device, read October 2026); 1.2 TB cap, $10 per 50 GB and $100 maximum from Xfinity, August 2026. Part blocks rounded up (our assumption).

Find your nightly 4K hours (one 4K TV on Netflix, 30 days), then read across at what the rest of the house uses a month. Each cell is the overage outside the courtesy month.

The tinted cell is the worked example, bedroom TV folded into the 430 GB column. One hour less of 4K takes that house to $0; one hour more triples the bill to $60. The late hours cost money, not the first.

What happens if I go over my data cap?

On a capped Xfinity plan, the first month over in any 12 is free under Xfinity's current policy, and after that each 50 GB block costs $10 until the monthly charge reaches $100.

The courtesy month is generous. Well, generous once, and Xfinity says it is subject to change.

The ceiling has an odd consequence. By our arithmetic ten blocks hit it at 1,700 GB, and anything beyond is free that month. Land there twice a year and you are paying for unlimited data without getting it; we would price the unlimited option then.

Overage often comes from screens nobody is watching. A household on Xfinity's community forum reported 1,255 GB in May 2024, writing "We don't have any significant changes to our online habits." Staff pointed at consoles stuck downloading and apps streaming in the background.

Plenty of homes are not capped: Xfinity excludes new plans of 300 Mbps or more, several budget plans, and legacy plans across most of the Northeast, the Mid-Atlantic and DC. With no limit, cutting quality saves nothing, so check your meter or Xfinity's Terabyte Data Usage Plan page first.

If you are capped, the cheapest lever is the second screen. Netflix's Medium setting uses up to 0.7 GB an hour, about 90% less than 4K, and Low 0.3 GB. In the worked example, the bedroom TV on Medium drops from 180 GB to 42 GB and the month ends at 1,132 GB, under the line. Leave the main TV in 4K. If it looks flat, our guide to Filmmaker Mode looking too dark names the two settings to blame.

• Consoles and PCs pull big updates overnight; check the meter's daily view.
• Netflix's Auto setting follows connection speed, so a fast line keeps every screen at top quality.
• The courtesy month returns only a full year after you last used it.

Our call: for most capped houses the fix is a setting, not a new plan. This week, open your Xfinity data meter. No limit: keep every screen in 4K. A 1.2 TB limit: put secondary screens on Medium, and if the meter still ends past the line two months running, price unlimited data before paying another block.

The TV is dark, the remote is on the sofa arm, and a small light still glows under the screen. Nobody is watching, yet the set is drawing power. That is the quiet half of your TV electricity cost; the louder half is the picture mode you chose on set-up night. Which is bigger? Two settings decide it.

What sets your TV electricity cost each year?

Three numbers set it: the watts your picture mode draws while the screen is lit, the hours you watch, and the standby watts drawn the rest of the day, all priced at your local kWh rate.

Start with the clock. NEEA's April 2026 review (report E26-515) assumes a US set is on 5.2 hours a day and on standby the rest, so even a thin standby draw runs most of the day. Then price: the EIA's October 2026 outlook puts the 2025 US residential average at 17.30 cents per kWh and forecasts 18.21 for 2026. The sum underneath is watts times hours divided by 1,000, times your rate.

The preset is the second lever. In August 2025 What Hi-Fi? put an energy meter on a 65-inch Sony A95L OLED and logged 84 W in Professional, 108 in Cinema, 114 in Standard and 156 in Vivid, all in SDR. It treats Professional as roughly Sony's Filmmaker Mode, the setting our post on fixing a Filmmaker Mode picture that looks too dark covers. One set and one unnamed meter: treat the ratios as a guide. If yours is an OLED, what a five-year OLED burn-in warranty covers is the other long-horizon question.

Four derived numbers frame the decision, built on NEEA's averages (87 W for ENERGY STAR-qualifying 49 to 59 inch sets, 106.9 W for non-qualifying ones), the What Hi-Fi? readings and an 18-cent price.

Standby deserves the closer look because it is the only cost you pay while nothing is on. A set kept awake for a voice command or a cast request stays above its certified level, and ENERGY STAR's own criteria draw that line.

Does HDR make a TV use more power?

Sometimes, and by little: on the Sony measured, HDR drew 12 W more than SDR in Professional mode, 18 W less in Standard, 12 W less in Cinema and the same 156 W in Vivid.

What Hi-Fi? assumed HDR is 8% of viewing, about 110 of 1,369 hours a year, and admits it is a judgment: Ofcom publishes no split. Even all-HDR viewing in Professional would add roughly $4.10 a year at 18 cents (12 W × 5.2 h × 365 ÷ 1,000 = 22.8 kWh), and in Vivid HDR changed nothing. Switching HDR off to save power targets the smallest lever on the page.

Which TV picture mode uses the least energy?

On the one 65-inch OLED measured, the calmest preset, Professional, used the least and Vivid the most, and the grid below prices each draw at three electricity rates so you can find your own row.

Find your preset's draw on the left, then read across at your price per kWh. Cells are dollars a year at 5.2 hours a day and a certified 0.5 W standby; Pro is Sony's Professional mode.

The shaded cell, Standard at 18 cents, reads $40 a year. One column right adds $26, one row down adds $14, and one row up saves only $2: the real jump is from the calm presets to Vivid.

Worked example: a 65-inch set in Standard mode at 114 W, on 5.2 hours a day, 0.5 W standby for the other 18.8 hours, at 18 cents per kWh (the EIA forecast, rounded). On-mode: 114 W × 5.2 h = 592.8 Wh a day. Standby: 0.5 W × 18.8 h = 9.4 Wh. Together 602.2 Wh, times 365, is 219.8 kWh a year: $39.56 a year, $276.95 over seven years.

What does your TV cost to run?Set your preset's watts, your daily hours, the standby draw and your kWh price. The figures update as you move them.

Your numbers

Watts while on

114 W

60 W200 WHours on per day

5.2

2.07.0Standby watts

0.5 W

0.5 W16.0 WPrice per kWh

$0.18

$0.10$0.40Years you keep it

7

18

On-mode cost a year

$38.95

Standby cost a year

$0.62

Total a year

$39.56

Total over your years

$276.95

You would pay $39.56 a year and $276.95 over your years. The preset gap matters less than a leaky standby.Reset to the article's exampleSliders need JavaScript. Figures shown are the article's example.Rate from the EIA Short-Term Energy Outlook, October 2026 (18.21 cents for 2026); 5.2 hours a day from NEEA E26-515 (April 2026); 114 W is What Hi-Fi? Standard mode, SDR.

Does a TV use power when it is turned off?

Yes, a plugged-in TV that looks off still draws standby power, from about half a watt on a certified set to 15.72 W on the market average NEEA reports for non-qualifying sets.

NEEA's Table 4 gives 0.48 W for ENERGY STAR-qualifying sets (California Energy Commission test data). The 15.72 W is an observed market average from an unstated sample size: a warning about the category, not a promise about your set. At 18 cents, that spread is roughly $19 a year, against under a dollar for the certified level.

Our call: Vivid is not an obvious mistake in a sunlit room, or at least not one to sneer at; glare is a real reason to want brightness. Before paying for it nightly, read whether a matte screen is worth the trade.

• Read the label as a ceiling. The ENERGY STAR criteria page we could open (energystar.gov) carries a 30 October 2015 effective date and lists 0.5 W idle and 3 W where an outside signal can wake the set; NEEA cites current v9.1 at 1 W.
• Treat 114 W as a middle. NEEA's fleet average on-mode draw is 124 W as reported, 116 W as calculated, across sizes.
• Measure, then decide. A plug-in energy meter shows watts with the screen dark and again lit.

The decision this week is where to spend ten minutes: standby or picture mode. Plug a meter in behind the TV and read the watts with the screen dark. Above 3 W, hunt the standby setting first; near half a watt, move off Vivid to your calmest preset and stop there. Then put your own wattage and kWh rate into the calculator above.

Related: how much 4K streaming data usage eats into a 1.2 TB monthly cap