Why on MacBook and 802.11n speed is not more than 45 mbps?

Question

macOS

Hardware MacBook Pro (Retina, Mid 2012)
OS: 10.10.4 Router
TL-WR740N
It always pissed me off that on a poppy via Wi-Fi, the speed did not rise more than 40-45 Mbps. Although my provider, if you stick the cable into an old computer, calmly gives out 85-100 Mbps. I thought it was Wi-Fi after all, it should probably be so.
On the router it is written, as it were, up to 150 Mbps. Over time, the question began to torment why? I read the forums - they gave advice - to reflash the router. I reflashed, but the speed remained the same as it was 40-45.
Everything would have been fine if not for yesterday's incident.
One friend asked me to see what was happening with the laptop. I took it home for myself, did the rites of cleaning and reinstalling Windows, and decided to download some game in order to test the laptop for overheating. I put it on the jump, after a while I come and the game has already been downloaded. I think it's so fast. I tested the speed and through the waffle it showed me 94 Mbps on her laptop. Her laptop is an Acer Aspire V3. In fact, the waffle adapter is no better or worse than mine. But the speed is different. Everyone has N support - and this should mean that the speed is up to 150.
My question is no longer "how to make it 100 Mbps", but at least theoretical conjectures - why does my poppy give out 45 through a waffle, and her acer gives out all speed. The protocol is the same 802.11n (I set it in the router and mixed, and set only n - nothing helped)

Answer 1

tell me the testing methodology if it's not a secret

Answer 2

802.11n devices are typically configured to operate in legacy mode for compatibility with older networks.

Answer 3

So, I'll tell you everything I know about poppy wifi.
1) On the N band, it works in the 150mbits (not 300mbits) standard, therefore the maximum speed is about 70 Mbps.
2) In the AC range, the MacBook pulls to the maximum.
3) Mouse 2.4 magicm mouse, working on the blue tooth - extinguishes the speed of wi-fi twice.
4) when the blue tooth is on, the macbook extinguishes the entire speed of the dir 300 dlink router on all channels.
If you want a fast Internet (100Mbps), then the solution is either to use a cord (but I have late 15 "2013 and it's not there), or buy a 5GHz router with ac.