Data transfer extremely slow

My wifi network seems to be very slow in transferring data - Airplay on ATV or file exchange between macs is extremely slow. Playing Airplay video from iOS to ATV is worse than watching Youtube. My internal network appears slower than my internet connection.
Any suggestion on what I should check or reset? Thanks
It is a provider's Huawei modem and an Airport Extreme router, distance few meters. I will not wire devices:)

Please also note that using a "speed test service" like speedtest.net or other is a measurement of your WAN link, ie from your router's WAN interface to the specified test location. This is not a measurement of throughput to your "client device".  These results would be the same between your wireless client connected at a poor 1Mbps speed and your 1Gbps wired desktop.  Do not use these types of services as a measurement of throughput of your internal infrastructure.
Keep in mind file transfers in windows (like copy and paste to a file share) utilizes Microsoft's SMB/SMB2 protocol which is very chatty and very inneficient.  This is not a good throughput test.  Utilizing a pure TCP transfer method, like FTP, would give more realistic results.  Even better would be to utilize an application like iPerf to perform pure tcp/udp throughput testing.
Also, Microsoft tends to display transfers in terms of MegaBytes, rather than MegaBits.  Your 100Mbps (megabit) internet would provide a potential throughput of 12.5 MegaBytes.  The same as on your LAN.  When you're copying a file to a share and it's going at 2megaBytes per second, this is actually 16 megabits per second.  So, your client connected at 54Mbps, half-duplex, realizing a throughput of probably around 20-25mbps is actually doing pretty good to get 2-3 megabytes of transfer speed using SMB file transfers.
Unless you have true tcp throughput tests prior to changes and after changes, the data you have provided thus far is not indicative of poor performance.

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