How hot is too hot for 2019 mbp Lightroom import?

Started 3 months ago | Discussions
OP Chester McCheeserton Forum Member • Posts: 96
Re: How hot is too hot for 2019 mbp Lightroom import?

graybalanced wrote:

Chester McCheeserton wrote:

Fans were running I'd say medium audibly, not screaming tho.

If the fans are just at medium ,then I wouldn’t be worried about it.

The CPU usage on import is not about the import per se. It is about rendering every single raw in a row to generate previews. If you are making it generate 1:1 previews on import, then it is rendering every imported raw at full resolution. Since It does not use the GPU for this, it’s all on the CPU, so the CPUs work extra hard to get it done.

If you used the embedded previews option for instance, it would not need nearly as much CPU or get as hot. Instead of generating previews, it would just use the previews that came from the camera and only regenerate on demand the images you view in Develop.

Reviews I have seen are positive about the cooling abilities of the 2019 16” MacBook Pro so I don’t think it would overheat or throttle unnecessarily. It is seen as a major improvement over the last generations of the 15” MBP, which where widely criticized for poor cooling that held performance back.

Just seeing this now, Thanks, Yes I am rendering 1:1 previews on import, rather get it out of the way and have the speed later when I'm going through LR.

I was just concerned that the machine seemed almost too hot to touch with my hand yet the fans were just on medium, was thinking maybe I adjusted the temp settings/fan speed in my early attempts to make the machine run quieter based on some forum post, but no one here yet seems to be saying the temps I posted were cause for alarm.

OP Chester McCheeserton Forum Member • Posts: 96
Re: How hot is too hot for 2019 mbp Lightroom import?

Blunders wrote:

As others have mentioned, it seems that Apple prefer MacBooks to run hot and quiet rather than cool and noisy. My 2012 MacBook Pro was getting too hot to touch when doing jobs like video rendering and Lightroom exports.

i reset the SMC but that didn’t help, so I installed Macs Fan Control from and set it to control the fan speed based on CPU PECI temperature; the fan speeds up at 60 degrees C and maxes out at 80. Probably over-conservative but it works for me and keeps things nice and cool.

The app has a paid-for pro version with more options but the free version is doing what I require. I tried a few similar apps and found this one had a simple but intuitive interface.

I also found that FFMpeg is terrible for hogging the CPU and getting things hot, so I run AppPolice and have it set to limit FFMpeg to 90% CPU (out of a maximum 400%). Render jobs obviously take longer but I’d rather wait than feel like I’m setting the MacBook on fire.

Thanks. that is useful to know..

Never thought of intentionally limitiing Lightroom's CPU use...may look into that.

OP Chester McCheeserton Forum Member • Posts: 96
Re: How hot is too hot for 2019 mbp Lightroom import?

Also I've been using one of those silicon keyboard covers, and the machine is always in clamshell mode when importing and building LR  previews, maybe I will try not using it

graybalanced Veteran Member • Posts: 6,771
Re: How hot is too hot for 2019 mbp Lightroom import?

Sorry for the long delay in reply. Busy week.

Gesture wrote:

How much do these cost? What would be realistic run time for a laptop?

That is up to you. They come in a range of capacities. If you travel by air, you won’t want more than 99 watt-hours since the FAA carry-on limit is 100 watt-hours. That is about the same capacity as the 16" MacBook Pro battery (Apple went right up to the edge of the FAA carry-on limit), so I would guess the run time would be about the same.

If you have a MacBook Air, you only need 30 watts. You will have the widest choice of power banks, and also the lowest priced.

If you have a 13" MacBook Pro, then a 60 watt capacity power bank is what you need. MacBook Pro 16" means at least 96 watts, the most expensive and narrowest range of power bank options, but they do exist.

In reality you do not necessarily have to match or exceed the power output of the Apple adapter, but if you want full ability for the Mac to operate at full performance and also charge the internal battery, then you do want to match the Apple adapter wattage.

Here are some example reviews of power banks that can charge Mac and Windows laptops, and might answer some of your questions:

Gesture wrote:

I still consider it weird that we have to carry a power bank as big or bigger than a smart phone to be sure it has enough juice for the day, but so it is, I guess.

Two points.

If you want to carry a swappable battery for extra runtime, isn't that the same thing as a power bank, only much worse? Because a swappable battery is going to be at least as big as a power bank, about the same weight or more, probably a weirder shape, and worst of all, you cannot use it with anything else, only the laptop it was made for. When you use your swappable battery, where does the dead battery go? You still have to carry it with you.

With a power bank you are carrying something comparable in size or weight to a swappable battery (possibly even smaller), easier form factor, able to charge your phones, tablets, and (USB-PD) cameras, and easily able to be recharged itself outside the laptop.

The only factor in favor of the swappable battery is that it goes inside the laptop, so if you have to pick up and move the laptop, there is nothing else connected to also pick up, it's a little cleaner.

In all other respects the win is on the side of the power bank there.

Second point.

We are no longer talking about the laptops of 10-20 years ago where you were lucky to get 2-3 hours on a charge so you really really wanted a second battery. Thanks to advances in power management and CPU power per watt, today's Mac laptops can go 8-10 hours or more in moderate use. There can be enough juice for a whole day out. Of course, you only get maybe half that if working on photos/videos a lot, although that is still a lot more than in years past. They are the ones who mainly need these power banks: All day use with high performance activities away from an outlet.

But since I bought my MacBook Pro 2 years ago, the internal battery has performed well enough that I frequently leave the house without taking the AC adapter. I only take it if I know I am going to be doing hard photo/video work away from home for more than 3-4 hours. Even though I think USB-C PD is a great feature, I still after 2 years have not found it necessary to buy a second battery, swappable or not!

Gesture wrote:

I am a dinosaur. I do not believe in any locked-in not easily swapped component, especially the boot drive even more than the battery.

But even on most PC laptops, all you can change are RAM, hard drive, and battery. That is not a lot compared to a desktop, where you can change CPU, wireless card, power supply...

I agree with you about the hard drive. Apple should allow the internal MacBook Pro NVMe SSD to be swapped out for any other readily available NVMe SSD as in a PC laptop. Prices for those continue to drop, it's painful to not be able to put a larger capacity in a MBP later.

Gesture Veteran Member • Posts: 7,355
Re: How hot is too hot for 2019 mbp Lightroom import?

Thanks.  Very useful notes.  I have always had fixed computers but am thinking about the MacBook Air.

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