I have a moderate sized library ~7,000 photos, and sometimes it just goes away for 3 minutes or more with the spinning beach ball. Activity Monitor shows CPU usage of 95–100% for a task called photolibraryd, and Photos is shown in red as 'Not Responding'. Memory Pressure is low, there is very little other activity, maybe 10 - 15%.
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I do have a lot of Smart Albums, and I have folders that are nested 3 – 5 deep, with mostly Smart Albums in them. That may require a lot of index manipulation. I don't know enough about Photos to have any idea. I have also had Photos crash at least twice while in this state.
In earlier releases this has been attributed to refreshing thumbnails, rebuilding the Faces database, etc. after a new release. I've had this release installed for well over a week. I use Photos every day, and the problem isn't constant as I've seen it in earlier releases. Photos comes up, runs for awhile, then I get the beach ball. After awhile ~5 minutes everything settles down. Then some time later maybe 10 minutes, maybe 30, here we go again. etc. etc.
MacBook, macOS Sierra (10.12), 8 Gb Ram
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Clint,
One can only stuff 5 pounds of 'stuff' into a 5-pound bag. So, have two bags.
Any given radio frequency channel will have its respective bandwidth limitation. Translation: data rate. So, along the line of having two bags, have two RF channels. That's the concept of MIMO. MIMO means multiple input/multiple output.
If a device simply has MIMO, without more, it might mean 1x1 MIMO. This means that the device can use any of several RF input channels and any of several RF output channels (in full duplex) . . . but only one RF channel input at a time and only one RF channel output at a time. What 1x1 MIMO does is pick the channel with the best signal -- the one that is most likely to deliver the best speed. In this sense, 1x1 MIMO does enhance speed. But, the best one can get is the limit of the underlying signal -- whether that be WiFi a, b, g, n, ac, or even a cell signal.
On the other hand, 2x2 MIMO can concurrently operate on two full-duplex connections. That is, the device can use any of several RF input channels, two at a time -- same for output, two at a time. In your WiFi example, 2x2 MIMO can potentially deliver twice the speed of WiFi ac if the router and the device both have 2x2 MIMO. Key point: if your WiFi router is connected to the Internet via a 256K DSL line, the MIMO issue becomes mute.
The spec page for the iPhone 7 on Apple's web site states that its WiFi is MIMO as opposed to 2x2 MIMO. I don't know if this means that the iPhone 7 is only 1x1 MIMO or it was merely an error/oversight or Apple being humble. Alternatively, it might be a conscious choice: not 1GB of storage, 10K songs. Simple is better. However, you will find that certain smartphones expressly indicate that they have 2x2 MIMO for WiFi.
Along the line of MIMO is carrier aggregation or 'CA'. CA is MIMO for wireless carriers. A 'regular' or 'conventional' LTE network uses a 10 MHz carrier. Using QAM carrier modulation, you can get 8 bits per cycle (Hertz). That translates to about 80Mb/sec. They say 75Mb/sec.
The original 'Advanced' LTE networks have 2x2CA or 2xCA, which uses -- you guessed it -- two 10MHz bags for a total of 20MHz and (they say) 150Mb/sec. (Also called 'Cat 4' -- think Ethernet cable being called Cat 5/5e cable.) Then, the providers upped the carrier bandwidth to 20MHz. A 2xCA device would use a total bandwidth of 40MHz and achieve 300Mb/sec. (Cat 6)
Some 'Advanced' LTE networks have 3xCA. However, while 3xCA uses three bags, it only aggregates bandwidth totaling 40MHz and thus 300Mb/sec. Still Cat 6. Other 3xCA networks allow 3 x full 20MHz per channel and you get 450Mb/sec. Cat 9. Key point: in all of this, you need a network that does it and a device that does it. Low common denominator prevails.
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Qualcomm's latest LTE modems can do 8xCA and 16xCA. With 8xCA, I have seen sustained 1Gb/sec speed.
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Back to the iPhone 7, I scratch my head. Although not advertised as such, it has a maximum speed of 450Mb/sec. It should be labelled as Cat 9 but it the web site doesn't state it. It should be labelled as full 3xCA but the web site doesn't state it. As with the MIMO, I'm not certain why it is not fully listed on the web site spec sheet.
Hopefully this gives you an idea of the things in play . . . if I didn't put you to sleep.
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The amazing thing with all of this is that it's being done on a 4G network . . . today. Hang on for 5G, baby!