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Sort of a serious answer because I'm bored: You're thinking of speeding up the air when what you should be thinking about is speeding up the waves. But then your waves are reaching you plenty fast already with latency being in the single digit ms range. Not much of a point in trying to accelerate that, really. You won't notice anyway.
If you feel like your internet connection via Wi-Fi is slow then the bottleneck is probably not with the Wi-Fi part of your network but the Internet Access Point behind it. Or even further down the line.
Now this is based on the assumption that you are in a fairly typical network environment, i.e. using semi-current hardware with moderate, if any, electromagnetic interference in the area. If you're living right next to a high voltage transformer station and using a router from 2008 then, yes, you're going to have Wi-Fi performance issues.
But in most cases, people complaining about "slow Wi-Fi" are actually suffering from Internet connectivity issues.
Think of it this way: If you enjoy your McDonald's from the local franchise but you can only get 100 burgers per hour from them (of course you need MOAR!) then upgrading your 320hp Camaro to a 400hp Mustang is not going to enable you to pick up appreciably more burgers from the drive through in the same amount of time.
Not entirely true.
In an apartment in the middle of a city, noisy neighbours can be a problem.In those cases, it's best to jump to 5 GHz, and leave the 2.4 band alone.
Except if you have an ECOVACS cleaning robot which refuses to work with modern 5GHz networks. I actually had to install a Wi-Fi bridge to get around that limitation; thankfully, I still had one lying around. Helped me get a better signal for my phone in the bathroom as well.
But thank you for adding this information. Congestion due to interference from other networks (I guess that's what you meant) can definitely be a factor as well. I guess that's the problem with the notion of "normal" that I employed rather carelessly.
Sidenote: the fact that your Wi-Fi still works in those conditions at all instead of shutting down goes back to pioneering research done by actress-cum-scientist Hedy Lamarr during WW2. Amazing woman.
which refuses to work with modern 5GHz networks.
Companies that make IoT devices do this so they can save a bit of money. It lets them use lower end, cheaper wifi chips (or left over older-generation chips that they can buy at a discount). I'm not really a hardware person but apparently 2.4Ghz wifi radios are a lot simpler than 5Ghz ones. Apparently they're also $2-$3 cheaper which adds up when you're producing a lot of units.
Also, the 5Ghz band differs per country. For example, some channels are authorized in the USA but not in Europe. Some companies stick to 2.4Ghz to avoid having to make anything region-specific.
There are plenty of things in a normal home that can cause serious signal attenuation (just installed new energy efficient windows? whoops! those IR blocking coatings severely attenuate microwave signals too). Poor AP placement is a very common cause of "slow wifi" and has nothing to do with your internet uplink.
Again, you point out why "normal" is an iffy notion to begin with. Thank you for elaborating instead of just downvoting. 🙂
Failing to fully utilize the existing antenna diversity options on modern routers/APs might be another common cause that comes to mind.